资源简介

(共74张PPT)
SECTION Ⅲ　WRITING WORKSHOP，VIEWING WORKSHOP & READING CLUB
Ⅰ.重点单词
(一)词义匹配
答案：1－6　CFDBAE
语篇研析·教材精读
词
汇
预
习
1.journal
2．gap
3．identical
4．comic
5．evidence
6．expose A.the facts, signs or objects that make you believe that sth.is true
B．amusing and making you laugh
C．a newspaper or magazine that deals with a particular subject
D．similar in every detail
E．to show sth.that is usually hidden
F．a space between two things or in the middle of sth.
(二)结合语境从上面的表格中选择恰当的词填空
1．Most of these trips had exciting or _____ moments.
2．There is a lot of ________ that stress is partly responsible for disease.
3．A wise mother never _______ her children to the slightest possibility of danger.
4．The fingerprints of no two persons are _________．
5．All our results are published in scientific ________．
comic
evidence
exposes
identical
journals
(三)写出下列词汇的派生词
1．reflect v．反映；映出；反射→__________ n．沉思；想法；反射→reflective adj. 沉思的；深思的
2．journal n．日记，日志→__________ n．新闻记者；新闻工作者
3．identity n．身份；同一性→_________ adj.完全相同的；非常相似的
4．evident adj. 清楚的；显而易见的；显然的→________ n．证据，证明
5．expose v．使接触；使体验→________ n．揭露
reflection
journalist
identical
evidence
exposure
Ⅱ.重点短语
1．______________　努力
2．______ 融入
3．____________ 利用
4．_________ 坚持
5．_____________________ 习惯于做某事
6．__________ 平均
make an effort
fit in
make use of
insist on
be used to doing sth.
on average
Step Ⅰ Fast Reading
速读P62教材课文，回答下面的问题
What does it mean“to know the secrets of our memory” according to the writer
______________________________________________________________________________________________
教
材
精
读
To know the secrets of our memory means learning not only the facts about it,
but also the ways to improve it.
Step Ⅱ Careful Reading
Ⅰ.细读P62教材课文，判断正误
1．“The Secrets of Your Memory” has helped me better understand how my body works. (　　)
2．Most of us will have to make an effort when trying to remember things because no one has a photographic memory. (　　)
3．A person's memory doesn't change with age according to “The Secrets of Your Memory”．(　　)
4．Our memory is at its best state at the age of 25, which is surprising.(　　)
答案：1－4　FTFT
Ⅱ.细读P62教材课文，选择正确的选项
　After reading “The Secrets of Your Memory”，the writer wants to ________．
A．follow the advice provided but needn't to strengthen his memory
B．make connections with what he hasn't already learnt
C．do “spaced review” especially during the first day after learning
D．review plans for the work he needs to do in the near future
答案：C
知识探究·讲练互动
【重点词汇】
1．reflection n．沉思；想法；反射reflect v．仔细思考；表达；反映；反射
A LEARNING REFLECTION(教材原句)
学习反思
【语境体验】
①He didn't speak much, but what he said affords much food for reflection.
他的话虽然不多，却耐人寻味。
②Walking along the street, he was lost in reflection so that he almost ran against a passer-by.
当他在街上散步时，他陷入沉思，差点撞到了一个过路人。
③On reflection，he agreed to lend them the money.
经过思考后，他同意把钱借给他们。
①be lost in reflection　陷入深思中
②on reflection 再三考虑
归纳·拓展
【学以致用】　单句语法填空
①He admired his __________ (reflect) in the mirror.
②She was lost __ reflection, and did not seem to notice that everyone was looking at her.
③She decided, __ reflection, to accept the offer.
reflection
in
on
2．split v．分摊；分离；离开；分解
In my country, we usually split the bill and everyone pays their own share.(教材原句)
在我的国家，我们通常平分账单，每个人都付自己的一份。
【语境体验】
①They split the cost of the party between them.
他们两人分担了宴会的费用。
②She split the class into groups of four.
她按四人一组把全班分成若干小组。
③The singer split with his wife last June.
那位歌手去年六月份和妻子分手了。
①split ...into ...　把……分成……
②split with ... 与……断绝关系
归纳·拓展
【学以致用】　单句语法填空
①John has just split up ____ his girlfriend.
②I decided to split the class ____ three groups and teach them in turn.
with
into
3．fit in融入；适应，适合；装配好
Living in a foreign country sounds exciting, but it's not always easy to fit in with another culture.(教材原句)
生活在外国听起来很刺激，但是融入另一种文化并不总是那么容易。
【语境体验】
①How are you fitting in with your new colleagues in your new job
你在新的工作岗位上与新的同事合得来吗？
②It can not only help us keep fit but also improve our mood.
它不仅能帮助我们保持健康，而且改善了我们的心情。
③He isn't fit for his work.
他不适合做这项工作。
④The food isn't fit to eat.
这食物不好吃。
①fit in with ...　　适应……；与……一致
②keep fit 保持健康
③be fit for 适合
④be fit to do ... 适合做……
归纳·拓展
【学以致用】　完成句子
①This information does not ___________ what I was told yesterday.
这消息和我昨天听到的不一致。
② I joined the club but did not ______．
我参加了那个俱乐部，但并不是太适应。
③I will give you some advice about how to lose weight and ________．
我将给你提一些关于如何减肥、保持健康的建议。
④ I wonder if my idea __________ your plan
不知道我的想法是否适合你的计划？
⑤The spring here _________ drink.
这儿的泉水适合饮用。
fit in with
fit in
keep fit
is fit for
is fit to
4．make an effort努力；作出努力
That is to say, most of us will have to make an effort when trying to remember things.(教材原句)
也就是说，我们中的大多数人在试图记住一些事情的时候都会付出努力。
【语境体验】
①She made every effort to be a good student.
她努力要做个好学生。
②We should spare no effort to beautify our environment.
我们应该不遗余力地美化我们的环境。
③He lifted the big rock without effort.
他毫不费力地举起了这块大石头。
①make every effort to do sth. 尽力做某事
②spare no effort to do sth. 不遗余力地做某事
③without effort 毫不费力
归纳·拓展
【学以致用】　完成句子
①She ____________________ get it.
她努力想得到它。
②Everyone ought to have a will and __________________ achieve your aim.
每个人都应该有一种意志并且不遗余力地实现你的目标。
③She lifted the bag ______________．
她毫不费力就把包提了起来。
④It shows that if you ________________________，you can.
这一事实表明，如果你努力去改变，就一定可以做到。
made every effort to
spare no effort to
without effort
make an effort to change
随堂训练·巩固提升
Ⅰ.单词拼写
1．The water is so clear that you can see your __________ (映像) in it.
2．________ (此外), I will thank all the people who helped me.
3．I would rather pay for a meal than watch nine friends _____ (分摊) a bill.
4．The ___ (差距) between the rich and the poor has widened.
5．We are _________ (完全相同的) in our views of what should be done.
6．Via the Internet, we can be _______ (使接触) to infinite information.
7．When you have a realization, write it down in your _______ (日记)．
8．Mr.Singh said he was pleased with the _______ (结果)．
9．I like watching _______ (冲浪) competitions.
reflection
Moreover
split
gap
identical
exposed
journal
outcome
surfing
Ⅱ.选词填空
be used to doing sth.；on average；insist on；make an effort；fit in；make use of
1．John ______________ to finish his work today.
2．She tried to ______ with the others, but it was difficult.
3．We should ___________ our time to study.
4．We all ___________ his coming with us.
5．Tom __ quite _______ doing this kind of job.
6．You know how many people __________ read one copy
made an effort
fit in
make use of
insisted on
is
used to
on average
Ⅲ.完成句子
1．We must study hard _________________________________．
我们必须努力学习，适应现代社会。
2．_________________ to get along well with his classmates.
他努力和同学们友好相处。
3．He plays ________ the piano ________ the violin.
他不仅弹钢琴，也拉提琴。
to fit in with the modern society
He made an effort
not only
but also
4．I ________________________________ the point of his speech.
我发现要了解他演讲的主旨是非常困难的。
5．When people travel in Britain，_______________________________ on the left.
当人们在英国旅行时，他们必须习惯于在左侧开车。
found it difficult to understand
they have to be used to driving
课时规范训练
Ⅰ.单句语法填空
1．To date there is no ________ (evident) to support this theory.
2．________ (expose) to lead is known to damage the brains of young children.
3．A __________ (journal)all his life, he's now brought out a book.
4．There is no doubt that nothing can be obtained _______ effort.
5．Production of the goods must fit __ with the needs of the society.
6．Any given culture is a __________(reflect) of the politics and economics of a given society.
evidence
Exposure
journalist
without
in
reflection
Ⅱ.完成句子
1．There is a great deal here that ________________________.
这里有许多东西你可以充分利用。
2．She was not supposed to go but _____________________.
不该她去，她偏要去。
3．Our office ________________________ its surroundings.
我们的办公室跟周围的环境很协调，显得很漂亮。
4．_____________，I decide that I do believe them.
我沉思了一下，确定我真的相信他们。
5．I will _______________________ arrive on time.
我将尽一切努力准时到达。
you can make full use of
she insisted on going
fits in beautifully with
On reflection
make an/every effort to
Ⅲ.微写作
用本单元词汇或句式完成写作任务
汤姆不仅是一位伟大的科学家，而且是一位伟大的数学家。他非常喜欢关于圆周率 (pi) 和数字 (digit) 的数学知识。在业余时间，他会研究直升机(helicopter)飞行时的曲线(curve)。他还记得儿时(childhood)第一次在显微镜下观察细胞(cell)时兴奋(excitement)的情景。在他的一次演讲中，他提到他的父亲是他最感激的人。他爸爸总是对他说：“ 别紧张(Take it easy)! 反思 (review) 你的错误，寻找正确的技巧(technique)，一切都会好起来的。” 有一次，他的腿被一块锋利的 (sharp) 石头击中，是他的父亲及时(timely)把他送到医院的。他还定期(periodically)和父亲谈论自己的情感(emotional)问题。当他重讲(retell)这段记忆(memorisation) 时，眼里充满了泪水。多亏了他的父亲，现在他取得了许多重大(significant)成就，出版(publish)了许多书。
______________________________________________________________
______________________________________________________________
______________________________________________________________
______________________________________________________________
【参考范文】
Tom is not only a great scientist, but also a great mathematician. He loves mathematical knowledge about pi and digits so much.In his spare time, he would study the curve of helicopter while flying.He still remembered the excitement when he observed the cells under the microscope for the first time in his childhood. In one of his speeches，he mentioned that his father was the person he was most grateful to.His dad always said to him “Take it easy! Review your mistakes and look for the right technique, and all is good.” Once he was hit in the leg by a sharp stone, and it was his father who sent him to hospital timely.He also periodically talks to his father about his emotional problems. His eyes were filled with tears when he retold this memorisation.Thanks to his father, now he has made many significant achievements and published many books.
Ⅳ.阅读理解
When Sarah Wishnia received an iPad from her daughter, “It was like Greek to me.” Max Rosenblum showed her how to socialize on social media and shop on Amazon with her new device.With Max's help, Elena learned to give orders to Siri, Mike familiarized himself with Waze and Honey began searching for information about movies, restaurants and books on her smartphone.Max is 16, a rising junior in Davie. His students are residents of Coral Gables, fascinated by technology and eager to learn about this brave new frontier. Max began offering his tech coaching for seniors a year ago, after he helped his grandmother with her iPhone and iPad. He taught her how to text and use social media. He also downloaded a Scrabble app for her to play. “She loved it，”he said, not without a trace of pride.
That experience inspired him and his parents, Adam and Heather. They reached out to a connection at Coral Gables and launched a website, . He also recruited(招募)other teens to teach the one-on-one lessons in Coral Gables. These youths go to the retirement communities at least once a month. Though teaching a class might appear to be more expedient，soon Max found out that group sessions simply didn't work.“People are at different levels，and it was hard to teach that way，” he said. “It's much better to give them individual help.” “Most people come more than once，” he added. “I have my regulars.”
“First he showed me how to get my email on the phone，” Rosen, 88, said, “and then he wrote up a short step-by-step guide for me so I could remember.” Max admits that teaching older adults takes time, but he figures he's also paying it forward.
“Maybe when I'm 87 and there's new technology，”he said，“somebody will teach me, too.”
【语篇解读】　本文是一篇记叙文。作为科技迷的16岁少年Max在教会了奶奶学习使用iPhone和iPad之后得到启发，在父母的帮助下，推出网站并招募了一群小伙伴专门为老年人提供一对一的指导学习新科技。
1．What can we infer about Sarah Wishnia when she received the iPad
A．She had no interest in it.
B．She could not shop on Amazon.
C．She had some difficulty using it.
D．She managed to use it by herself.
解析：C　推理判断题。根据第一段中“When Sarah Wishnia received an iPad from her daughter, ‘It was like Greek to me.’Max Rosenblum showed her how to socialize on social media and shop on Amazon with her new device.”可知，Sarah是不会用电子设备的，因此，她使用起来是有困难的。故选C。
2．Why did Max begin teaching seniors to use smart devices
A．Because he was familiar with the new frontier.
B．Because he enjoyed talking with senior residents.
C．Because he wanted to apply the new technology.
D．Because he got inspired after teaching his grandma.
解析：D　细节理解题。根据题干关键词“teaching seniors to use smart devices”可以定位到文章第一段中“Max began offering his tech coaching for seniors a year ago, after he helped his grandmother with her iPhone and iPad.”和第二段第一句“That experience inspired him and his parents, Adam and Heather.”可知，Max是帮助祖母使用iPhone和iPad后受到启发，然后开始教老年人使用智能设备。故选D。
3．Which of the following best explains “expedient” underlined in Paragraph 2
A．Exhausting.　　　 B．Practical.
C．Profitable. D．Creative.
解析：B　词义猜测题。第二段中“Though teaching a class might appear to be more expedient,_soon Max found out that group sessions simply didn't work.”，由前后转折关系判断出这个词的意思应当是正向的，排除A。再由后文“‘People are at different levels, and it was hard to teach that way，’he said. ‘It's much better to give them individual help.’”进一步的解释中了解到班级教学尽管实用，但是个别帮助更好一些，选项B意为“实用的”，符合语境，故选B。
4．Where is this text most likely from
A．A science book.
B．A travel guide.
C．A local newspaper.
D．A product introduction.
解析：C　推理判断题。文章讲述了作为科技迷的16岁少年Max在教会了奶奶学习使用iPhone和iPad之后得到启发，在父母的帮助下，推出网站并招募了一群小伙伴专门为老年人提供一对一的指导学习新科技。文章为记叙类，讲述事件内容，符合新闻写作习惯。故判断出短文来自当地报纸。故选C。
Ⅴ.语法填空
For many，holiday celebrations mean large meals shared with family and friends，but such 1.________(feast) can produce huge amounts of food waste, harming the environment and wasting 2.________ (nature) resources－unless mindful merry makers take necessary steps.
Be mindful of 3.________you already have.Try keeping food in glass jars. Using this method，all 4.________food in your kitchen becomes visible and will be easily remembered and consumed.
Shop smart.Most anti-food waste experts agree that planning a holiday menu before 5.________(head) to the grocery store—and sticking to it—is one of the best ways to start off a 6.________(little) wasteful holiday.Starting with an idea of who will 7.________ (invite) and exactly how much food to prepare will save a lot of littering.
Use leftovers 8.________(wise)．It may be impossible to get everyone into the clean plate club, but that doesn't mean leftover food has to go waste.Freeze and repurpose leftovers by using them 9.________basic ingredients (原料) for other recipes or send extras home with guests.
Always remember: When you throw away food, you're also throwing away the land，water and energy used 10.________(produce) that food.
【语篇解读】　本文是一篇议论文。文章就目前节日期间很多人大肆吃喝，浪费食物的现象提出一些建议。
1．解析：feasts　考查名词单复数。结合语境可知，此处特指前文提到的large meals，所以应用复数形式。故填feasts。
2．解析：natural　考查形容词。此处应用形容词修饰名词resource。故填natural。
3．解析：what　考查连接词。分析句子可知，此处是宾语从句连接词，从句缺少宾语，且意为“东西”，指物，应用指物的连接代词。故填what。
4．解析：the　考查冠词。此处特指你厨房里的所有食物，应用定冠词。故填the。
5．解析：heading　考查非谓语动词。此处应用head的动名词形式作为介词before的宾语。故填heading。
6．解析：less　考查比较级。结合上下文可知，此处意为“开始一个不那么浪费的假期”，less wasteful“不那么浪费的”。故填less。
7．解析：be invited　考查语态。主语who和invite之间是动宾关系，应用被动语态，又因will后接动词原形。故填be invited。
8．解析：wisely　考查副词。此处应用副词修饰动词use。故填wisely。
9．解析：as　考查介词。结合上下文可知，此处意为“把它们当作基本原料来用”，use ...as ...“把……当作……来用”。故填as。
10．解析：to produce　考查非谓语动词。根据句意和句子结构可知，此处应填不定式表目的，use ...to do ...“用……来做……”。故填to produce。
课时规范训练
点击进入WORD链接
Ⅰ.阅读理解
Students should be able to show what they know.Many folks take this as a self-evident truth.But I think it demands closer examination.
Possessing a skill or piece of knowledge is not the same thing as being able to show it.This is why many smart young people hate school.Understanding, figuring out, and getting a handle on a piece of knowledge is really exciting, but having to prove to somebody else that you understand is a_big_fat_pain_in_the_neck．
随堂训练·巩固提升
Finding proof of student learning is a huge part of the teacher's job, and whether it is done poorly or not makes all the difference in that teacher's effectiveness.There is a huge difference between “How do I figure out if this student understands” and “How do I make this student prove to me he gets it.” The first is a valuable approach; the second is the first step on the road toward wasting everybody's time.
And there's the problem.If we start with the assumption that a student knows he is able to show his knowledge to our satisfaction, we will be traveling down the wrong road.The more we demand that students prove to us that they know the stuff, the more we will design artificial tasks that demand a set of skills and knowledge entirely different from the skills and knowledge we really want to measure.
As a classroom teacher, I have to remember that the burden is on me to find a way to see what my students know; the burden is not on them to put on whatever trained monkey show I design for my own ease and convenience.
It may not be the worst thing ever to say “Students should be able to show what they know.” But I think it's far more useful to say, “Teachers should be able to discover what students know.”
【语篇解读】　本文是一篇议论文。文章论述了这样的观点：教师应当能够发现学生是否学到了知识，而不是一味地要求学生展示自己所学的知识。
1．What does the underlined phrase in the second paragraph mean
A．Very dangerous. B．Very annoying.
C．Very difficult. D．Very frequent.
解析：B　词义猜测题。根据第二段中but前面“Understanding, figuring out，and getting a handle on a piece of knowledge is really exciting”可知，理解、弄明白并掌握一项知识确实令人兴奋，但必须向别人证明你已经理解它了，这是一件非常讨厌的事。由此可知画线部分的意思是“非常讨厌的”。故B项正确
2．According to the third paragraph, a teacher should have the ability to ________．
A．discover whether his students know
B．avoid wasting the precious time in class
C．apply various approaches while teaching
D．give students the chance to prove themselves
解析：A　细节理解题。根据第三段中的“Finding proof of student learning is a huge part of the teacher's job, and whether it is done poorly or not makes all the difference in that teacher's effectiveness.”可知，掌握学生学习的证据(知道学生学到了什么)是教师工作的一个重要组成部分，而这项工作做得如何将对教师的工作效率产生重大影响。由此可知，作者认为教师应当能够发现学生是否学到了知识。故A项正确。
3．What does the author think of the artificial tasks designed to test students' learning
A．They should be limited in number.
B．They are a huge burden on teachers.
C．They should mainly focus on effectiveness.
D．They slide away from their original purpose.
解析：D　推理判断题。根据第四段中的“The more we demand that students prove to us that they know the stuff, the more we will design artificial tasks that demand a set of skills and knowledge entirely different from the skills and knowledge we really want to measure.”可知，我们越是要求学生向我们证明他们知道这些东西，我们设计的人工任务就越需要一套与我们真正想要衡量的技能和知识完全不同的技能和知识。由此可知，作者认为那些为了测试学生的学习情况而编制的任务最终偏离了最初的目的，达不到预期的效果。故D项正确。
4．What is the main idea of the passage
A．Students should be able to show what they know.
B．There are many ways to find proof of student learning.
C．Teachers should be able to discover what students know.
D．There should be better understanding between teachers and students.
解析：C　主旨大意题。通读全文，特别是最后一段中的“Teachers should be able to discover what students know.”可知，本文主要讲的是老师应该有能力发现学生学到的知识。故C项正确。
Ⅱ.完形填空
Concerns about the harm caused by “too much” screen time—particularly when it is spent on social media—are widespread.But working out what a “healthy” ___1___ might be is far from easy.
Some negative experiences on social media—like ___2___ how your appearance compares to others—do affect some children.However, this does not mean that technology use in ___3___ is harmful and it is difficult to make claims about how it will affect different people.
Consider the picture painted by a UNICEF review of existing research into the effects of digital technology on children's ___4___ comfort, including happiness, mental health and social life.Rather than stating that social media was harmful, it suggested a more ___5___ effect.
The UNICEF report highlighted a 2017 study that examined 120，000 UK 15-year-olds.Among those teenagers who were the lightest users, it was found that increasing the time spent using technology was linked to ___6___ comfort—possibly because it was important for keeping up friendships.__7__，among the heaviest users of technology, any increase in time was linked to lower levels of comfort.Overall, the UNICEF study suggested that some screen time could be good for children's mental health.
A broader look at evidence provided by some other high quality studies again suggests the story is not ___8___．An early study in 2013 looked at how the television and video game habits of 11，000 UK five-year-olds affected them two years later.It is one of few studies actually ___9___ the effects of technology over time.It suggested that, compared with children who watched one hour of television or less on a weekday, a small increase in conduct problems was seen among those who watched more than three hours each day.Playing electronic games, however, was not seen as leading to a greater ___10___ of friendship or emotional problems.
So how much time should our children spend looking at screens It is difficult to be ___11___ as different people spend time online in such different ways.A useful comparison might be with sugar.Broadly speaking, people ___12___ that too much sugar can be bad for your health.But the effect it might have can depend on many factors, from the type of sugar to the person and the amount.We would not ___13___ trust anyone who claims to predict how someone is affected by consuming one gram of sugar.The same could be said for ___14___ usage: the outcomes depend on so many factors that only very ___15___ predictions are possible.
【语篇解读】　本文是一篇说明文。文章介绍了社交媒体使用的结果取决于很多因素，所以很难精确地界定一个健康的屏幕时间的量。
1．A.amount B．comparison
C．experience D．medium
解析：A　句意：人们普遍担心“过多”的屏幕时间(尤其是在社交媒体上)会造成伤害。但要弄清楚一个“健康”的量是多么的不容易。amount“数量”；comparison“比较”；experience“经验”；medium“媒介”。空前说人们普遍担心“过多”的屏幕时间会造成伤害；再结合下文的研究可知，要弄清楚一个健康的屏幕时间的量很不容易。故A项正确。
2．A.accounting for B．boasting of
C．commenting on D．worrying about
解析：D　句意：社交媒体上的一些负面经历，比如担心自己的外貌与别人的比较，确实会影响一些孩子。account for“导致”；boast of“吹嘘”；comment on“评述”；worry about“担心”。根据空后的“how your appearance compares to others—do affect some children”可知，担心自己的外貌与别人的比较会对一些孩子造成影响。故D项正确。
3．A.general B．particular
C．private D．public
解析：A　句意：然而，这并不意味着(数字)技术的普遍使用是有害的，而且很难断言它如何影响不同的人。in general“通常，普遍”；in particular“特别，尤其”；in private“私下”；in public“当众”。根据常识可知，数字技术是现代社会的人们普遍使用的。故A项正确。
4．A.domestic B．material
C．physical D．psychological
解析：D　句意：想想联合国儿童基金会所描述的关于数字技术对儿童心理安慰的影响的研究，包括幸福、心理健康和社会生活。domestic“国内的”；material“物质的”；physical“体力的”；psychological“心理的”。根据空后的“including happiness，mental health and social life”可知，此处指“心理安慰”。故D项正确。
5．A.complex B．dramatic
C．harmless D．predictable
解析：A　句意：它没有说社交媒体有害，而是表明了一种更复杂的影响。complex“复杂的”；dramatic“引人注目的”；harmless“无害的”；predictable“可预言的”。根据下文对其研究发现的介绍可知，联合国儿童基金会的研究表明社交媒体对儿童的影响很复杂。故A项正确。
6．A.improved B．maximum
C．relative D．small
解析：A　句意：研究发现，在那些最不常使用电子产品的青少年中，增加使用电子产品的时间可能与提高舒适度有关，因为这对维持友谊很重要。improved“改进的，提高的”；maximum“最大极限的”；relative“相关的”；small“小的”。根据空后的“possibly because it was important for keeping up friendships”可知，因为这对维持友谊很重要，所以对那些最不常使用电子产品的青少年来说，增加使用电子产品的时间会提高舒适度。故A项正确。
7．A.As a rule B．In contrast
C．On the whole D．Worse still
解析：B　句意：相比之下，在使用科技产品最多的人群中，任何时间的增加都与舒适程度的降低有关。as a rule“照例”；in contrast“相比之下，与此相反”；on the whole“大体上”；worse still“更糟的是”。根据语境可知，此处是与那些最不常使用电子产品的青少年的对比。故B项正确。
8．A.convincing B．definite
C．probable D．true
解析：B　句意：对其他一些高质量研究提供的证据进行更广泛的研究再次表明，这一说法并不能站得住脚。convincing“令人信服的”；definite“一定的，确切的”；probable“可能的”；true“正确的”。根据下文对2013年的一项早期研究结果的介绍可知，空前说的一些屏幕时间可能有利于儿童的心理健康这种说法是站不住脚的。故B项正确。
9．A.estimating B．experiencing
C．reducing D．tracing
解析：D　句意：这是为数不多的追踪技术的影响随时间变化的研究之一。estimate“评估”；experience“体验”；reduce“减少”；trace“追踪”。空前说2013年的一项早期研究调查了11 000名英国5岁儿童的电视和视频游戏习惯两年后对他们的影响，这说明这项研究追踪了技术的影响随时间变化。故D项正确。
10．A.connection B．power
C．promotion D．risk
解析：D　句意：然而，玩电子游戏并没有被认为会导致更大的友谊或情感问题的风险。connection“连接”；power“力量”；promotion“提升”；risk“风险”。根据空后的“of friendship or emotional problems”可知，此处指“友谊或情感问题的风险”。故D项正确。
11．A.balanced B．independent
C．precise D．subjective
解析：C　句意：那么我们孩子的屏幕时间应该是多少呢？由于不同的孩子在网上花费时间的方式不同，所以很难准确地界定。balanced“平衡的”；independent“独立的”；precise“明确的，精确的”； subjective“主观的”。不同的孩子在网上花费时间的方式不同，所以很难准确地界定孩子健康的屏幕时间的量。故C项正确。
12．A.agree B．forget
C．object D．remember
解析：A　句意：一般来说，人们都认为过多的糖对健康有害。agree“同意”；forget“忘记”；object“反对”；remember“记得”。根据空后的“that too much sugar can be bad for your health”可知，一般来说，人们都会同意过多的糖是对健康有害的。故A项正确。
13．A.equally B．readily
C．reluctantly D．weakly
解析：B　句意：我们不会轻易相信那些声称能预测一克糖对人的影响的人。equally“平等地”；readily“容易地”；reluctantly“勉强”；weakly“无力地”。空前说它可能产生的效果取决于从糖的种类到人以及糖的量等许多因素，所以我们不会再轻易相信那些声称能预测一克糖对人的影响的人。故B项正确。
14．A.emotion therapy B．social media
C．TV broadcasting D．video game
解析：B　句意：社交媒体的使用也是如此：结果取决于如此多的因素，以至于只能粗略地预测。emotion therapy“情绪疗法”；social media“社交媒体”；TV broadcasting“电视广告”；video game“视频游戏”。本文主要讲的就是社交媒体的屏幕时间。故B项正确。
15．A.confident B．optimistic
C．rough D．wild
解析：C　句意参见上题解析。confident“自信的”；optimistic“乐观的”；rough“粗略的”；wild“荒凉的”。社交媒体使用的结果取决于很多因素，所以不能精确地说出一个健康的屏幕时间，只能是粗略地预测。故C项正确。SECTION Ⅲ　WRITING WORKSHOP，VIEWING
WORKSHOP & READING CLUB
Ⅰ.重点单词
(一)词义匹配
1．journal 2．gap 3．identical4．comic 5．evidence 6．expose A.the facts, signs or objects that make you believe that sth.is trueB．amusing and making you laughC．a newspaper or magazine that deals with a particular subjectD．similar in every detailE．to show sth.that is usually hidden F．a space between two things or in the middle of sth.
答案：1－6　CFDBAE
(二)结合语境从上面的表格中选择恰当的词填空
1．Most of these trips had exciting or comic moments.
2．There is a lot of evidence that stress is partly responsible for disease.
3．A wise mother never exposes her children to the slightest possibility of danger.
4．The fingerprints of no two persons are identical．
5．All our results are published in scientific journals．
(三)写出下列词汇的派生词
1．reflect v．反映；映出；反射→reflection n．沉思；想法；反射→reflective adj. 沉思的；深思的
2．journal n．日记，日志→journalist n．新闻记者；新闻工作者
3．identity n．身份；同一性→identical adj.完全相同的；非常相似的
4．evident adj. 清楚的；显而易见的；显然的→evidence n．证据，证明
5．expose v．使接触；使体验→exposure n．揭露
Ⅱ.重点短语
1．make an effort　努力
2．fit in 融入
3．make use of 利用
4．insist on 坚持
5．be used to doing sth. 习惯于做某事
6．on average 平均
Step Ⅰ Fast Reading
速读P62教材课文，回答下面的问题
What does it mean“to know the secrets of our memory” according to the writer
To know the secrets of our memory means learning not only the facts about it, but also the ways to improve it.
Step Ⅱ Careful Reading
Ⅰ.细读P62教材课文，判断正误
1．“The Secrets of Your Memory” has helped me better understand how my body works. (　　)
2．Most of us will have to make an effort when trying to remember things because no one has a photographic memory. (　　)
3．A person's memory doesn't change with age according to “The Secrets of Your Memory”．(　　)
4．Our memory is at its best state at the age of 25, which is surprising.(　　)
答案：1－4　FTFT
Ⅱ.细读P62教材课文，选择正确的选项
After reading “The Secrets of Your Memory”，the writer wants to ________．
A．follow the advice provided but needn't to strengthen his memory
B．make connections with what he hasn't already learnt
C．do “spaced review” especially during the first day after learning
D．review plans for the work he needs to do in the near future
答案：C
【重点词汇】
1．reflection n．沉思；想法；反射reflect v．仔细思考；表达；反映；反射
A LEARNING REFLECTION(教材原句)
学习反思
【语境体验】
①He didn't speak much, but what he said affords much food for reflection.
他的话虽然不多，却耐人寻味。
②Walking along the street, he was lost in reflection so that he almost ran against a passer-by.
当他在街上散步时，他陷入沉思，差点撞到了一个过路人。
③On reflection，he agreed to lend them the money.
经过思考后，他同意把钱借给他们。
①be lost in reflection　陷入深思中
②on reflection 再三考虑
【学以致用】　单句语法填空
①He admired his reflection (reflect) in the mirror.
②She was lost in reflection, and did not seem to notice that everyone was looking at her.
③She decided, on reflection, to accept the offer.
2．split v．分摊；分离；离开；分解
In my country, we usually split the bill and everyone pays their own share.(教材原句)
在我的国家，我们通常平分账单，每个人都付自己的一份。
【语境体验】
①They split the cost of the party between them.
他们两人分担了宴会的费用。
②She split the class into groups of four.
她按四人一组把全班分成若干小组。
③The singer split with his wife last June.
那位歌手去年六月份和妻子分手了。
①split ...into ...　把……分成……
②split with ... 与……断绝关系
【学以致用】　单句语法填空
①John has just split up with his girlfriend.
②I decided to split the class into three groups and teach them in turn.
3．fit in融入；适应，适合；装配好
Living in a foreign country sounds exciting, but it's not always easy to fit in with another culture.(教材原句)
生活在外国听起来很刺激，但是融入另一种文化并不总是那么容易。
【语境体验】
①How are you fitting in with your new colleagues in your new job
你在新的工作岗位上与新的同事合得来吗？
②It can not only help us keep fit but also improve our mood.
它不仅能帮助我们保持健康，而且改善了我们的心情。
③He isn't fit for his work.
他不适合做这项工作。
④The food isn't fit to eat.
这食物不好吃。
①fit in with ...　　适应……；与……一致
②keep fit 保持健康
③be fit for 适合
④be fit to do ... 适合做……
【学以致用】　完成句子
①This information does not fit in with what I was told yesterday.
这消息和我昨天听到的不一致。
② I joined the club but did not fit in．
我参加了那个俱乐部，但并不是太适应。
③I will give you some advice about how to lose weight and keep fit．
我将给你提一些关于如何减肥、保持健康的建议。
④ I wonder if my idea is fit for your plan
不知道我的想法是否适合你的计划？
⑤The spring here is fit to drink.
这儿的泉水适合饮用。
4．make an effort努力；作出努力
That is to say, most of us will have to make an effort when trying to remember things.(教材原句)
也就是说，我们中的大多数人在试图记住一些事情的时候都会付出努力。
【语境体验】
①She made every effort to be a good student.
她努力要做个好学生。
②We should spare no effort to beautify our environment.
我们应该不遗余力地美化我们的环境。
③He lifted the big rock without effort.
他毫不费力地举起了这块大石头。
①make every effort to do sth. 尽力做某事
②spare no effort to do sth. 不遗余力地做某事
③without effort 毫不费力
【学以致用】　完成句子
①She made every effort to get it.
她努力想得到它。
②Everyone ought to have a will and spare no effort to achieve your aim.
每个人都应该有一种意志并且不遗余力地实现你的目标。
③She lifted the bag without effort．
她毫不费力就把包提了起来。
④It shows that if you make an effort to change，you can.
这一事实表明，如果你努力去改变，就一定可以做到。
Ⅰ.单词拼写
1．The water is so clear that you can see your reflection (映像) in it.
2．Moreover (此外), I will thank all the people who helped me.
3．I would rather pay for a meal than watch nine friends split (分摊) a bill.
4．The gap (差距) between the rich and the poor has widened.
5．We are identical (完全相同的) in our views of what should be done.
6．Via the Internet, we can be exposed (使接触) to infinite information.
7．When you have a realization, write it down in your journal (日记)．
8．Mr.Singh said he was pleased with the outcome (结果)．
9．I like watching surfing (冲浪) competitions.
Ⅱ.选词填空
be used to doing sth.；on average；insist on；make an effort；fit in；make use of
1．John made an effort to finish his work today.
2．She tried to fit in with the others, but it was difficult.
3．We should make use of our time to study.
4．We all insisted on his coming with us.
5．Tom is quite used to doing this kind of job.
6．You know how many people on average read one copy
Ⅲ.完成句子
1．We must study hard to fit in with the modern society．
我们必须努力学习，适应现代社会。
2．He made an effort to get along well with his classmates.
他努力和同学们友好相处。
3．He plays not only the piano but also the violin.
他不仅弹钢琴，也拉提琴。
4．I found it difficult to understand the point of his speech.
我发现要了解他演讲的主旨是非常困难的。
5．When people travel in Britain，they have to be used to driving on the left.
当人们在英国旅行时，他们必须习惯于在左侧开车。
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Ⅰ.单句语法填空
1．To date there is no evidence (evident) to support this theory.
2．Exposure (expose) to lead is known to damage the brains of young children.
3．A journalist (journal)all his life, he's now brought out a book.
4．There is no doubt that nothing can be obtained without effort.
5．Production of the goods must fit in with the needs of the society.
6．Any given culture is a reflection(reflect) of the politics and economics of a given society.
Ⅱ.完成句子
1．There is a great deal here that you_can_make_full_use_of.
这里有许多东西你可以充分利用。
2．She was not supposed to go but she_insisted_on_going.
不该她去，她偏要去。
3．Our office fits_in_beautifully_with its surroundings.
我们的办公室跟周围的环境很协调，显得很漂亮。
4．On_reflection，I decide that I do believe them.
我沉思了一下，确定我真的相信他们。
5．I will make_an/every_effort_to arrive on time.
我将尽一切努力准时到达。
Ⅲ.微写作
用本单元词汇或句式完成写作任务
汤姆不仅是一位伟大的科学家，而且是一位伟大的数学家。他非常喜欢关于圆周率 (pi) 和数字 (digit) 的数学知识。在业余时间，他会研究直升机(helicopter)飞行时的曲线(curve)。他还记得儿时(childhood)第一次在显微镜下观察细胞(cell)时兴奋(excitement)的情景。在他的一次演讲中，他提到他的父亲是他最感激的人。他爸爸总是对他说：“ 别紧张(Take it easy)! 反思 (review) 你的错误，寻找正确的技巧(technique)，一切都会好起来的。” 有一次，他的腿被一块锋利的 (sharp) 石头击中，是他的父亲及时(timely)把他送到医院的。他还定期(periodically)和父亲谈论自己的情感(emotional)问题。当他重讲(retell)这段记忆(memorisation) 时，眼里充满了泪水。多亏了他的父亲，现在他取得了许多重大(significant)成就，出版(publish)了许多书。
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【参考范文】
Tom is not only a great scientist, but also a great mathematician. He loves mathematical knowledge about pi and digits so much.In his spare time, he would study the curve of helicopter while flying.He still remembered the excitement when he observed the cells under the microscope for the first time in his childhood. In one of his speeches，he mentioned that his father was the person he was most grateful to.His dad always said to him “Take it easy! Review your mistakes and look for the right technique, and all is good.” Once he was hit in the leg by a sharp stone, and it was his father who sent him to hospital timely.He also periodically talks to his father about his emotional problems. His eyes were filled with tears when he retold this memorisation.Thanks to his father, now he has made many significant achievements and published many books.
Ⅳ.阅读理解
When Sarah Wishnia received a tablet from her daughter, “It was like Greek to me.” Max Rosenblum showed her how to socialize on social media and shop online with her new device.With Max's help, Elena learned to give orders to voice assistant, Mike familiarized himself with a map app and Honey began searching for information about movies, restaurants and books on her smartphone.Max is 16, a rising junior in Davie. His students are residents of Coral Gables, fascinated by technology and eager to learn about this brave new frontier. Max began offering his tech coaching for seniors a year ago, after he helped his grandmother with her smartphone and tablet. He taught her how to text and use social media. He also downloaded a game app for her to play. “She loved it，”he said, not without a trace of pride.
That experience inspired him and his parents, Adam and Heather. They reached out to a connection at Coral Gables and launched a website, . He also recruited (招募) other teens to teach the one on one lessons in Coral Gables. These youths go to the retirement communities at least once a month. Though teaching a class might appear to be more expedient，soon Max found out that group sessions simply didn't work.“People are at different levels，and it was hard to teach that way，” he said. “It's much better to give them individual help.” “Most people come more than once，” he added. “I have my regulars.”
“First he showed me how to get my email on the phone，” Rosen, 88, said, “and then he wrote up a short step by step guide for me so I could remember.” Max admits that teaching older adults takes time, but he figures he's also paying it forward.
“Maybe when I'm 87 and there's new technology，”he said，“somebody will teach me, too.”
【语篇解读】　本文是一篇记叙文。作为科技迷的16岁少年Max在教会了奶奶学习使用智能手机和平板电脑之后得到启发，在父母的帮助下，推出网站并招募了一群小伙伴专门为老年人提供一对一的指导学习新科技。
1．What can we infer about Sarah Wishnia when she received the tablet
A．She had no interest in it.
B．She could not shop online.
C．She had some difficulty using it.
D．She managed to use it by herself.
解析：C　推理判断题。根据第一段中“When Sarah Wishnia received a tablet from her daughter, ‘It was like Greek to me.’Max Rosenblum showed her how to socialize on social media and shop online with her new device.”可知，Sarah是不会用电子设备的，因此，她使用起来是有困难的。故选C。
2．Why did Max begin teaching seniors to use smart devices
A．Because he was familiar with the new frontier.
B．Because he enjoyed talking with senior residents.
C．Because he wanted to apply the new technology.
D．Because he got inspired after teaching his grandma.
解析：D　细节理解题。根据题干关键词“teaching seniors to use smart devices”可以定位到文章第一段中“Max began offering his tech coaching for seniors a year ago, after he helped his grandmother with her smartphone and tablet.”和第二段第一句“That experience inspired him and his parents, Adam and Heather.”可知，Max是帮助奶奶使用智能手机和平板电脑后受到启发，然后开始教老年人使用智能设备。故选D。
3．Which of the following best explains “expedient” underlined in Paragraph 2
A．Exhausting.　　　 B．Practical.
C．Profitable. D．Creative.
解析：B　词义猜测题。第二段中“Though teaching a class might appear to be more expedient,_soon Max found out that group sessions simply didn't work.”，由前后转折关系判断出这个词的意思应当是正向的，排除A。再由后文“‘People are at different levels, and it was hard to teach that way，’he said. ‘It's much better to give them individual help.’”进一步的解释中了解到班级教学尽管实用，但是个别帮助更好一些，选项B意为“实用的”，符合语境，故选B。
4．Where is this text most likely from
A．A science book.
B．A travel guide.
C．A local newspaper.
D．A product introduction.
解析：C　推理判断题。文章讲述了作为科技迷的16岁少年Max在教会了奶奶学习使用智能手机和平板电脑之后得到启发，在父母的帮助下，推出网站并招募了一群小伙伴专门为老年人提供一对一的指导学习新科技。文章为记叙类，讲述事件内容，符合新闻写作习惯。故判断出短文来自当地报纸。故选C。
Ⅴ.语法填空
For many，holiday celebrations mean large meals shared with family and friends，but such 1.________(feast) can produce huge amounts of food waste, harming the environment and wasting 2.________ (nature) resources－unless mindful merry makers take necessary steps.
Be mindful of 3.________you already have.Try keeping food in glass jars. Using this method，all 4.________food in your kitchen becomes visible and will be easily remembered and consumed.
Shop smart.Most anti food waste experts agree that planning a holiday menu before 5.________(head) to the grocery store—and sticking to it—is one of the best ways to start off a 6.________(little) wasteful holiday.Starting with an idea of who will 7.________ (invite) and exactly how much food to prepare will save a lot of littering.
Use leftovers 8.________(wise).It may be impossible to get everyone into the clean plate club, but that doesn't mean leftover food has to go waste.Freeze and repurpose leftovers by using them 9.________basic ingredients (原料) for other recipes or send extras home with guests.
Always remember: When you throw away food, you're also throwing away the land，water and energy used 10.________(produce) that food.
【语篇解读】　本文是一篇议论文。文章就目前节日期间很多人大肆吃喝，浪费食物的现象提出一些建议。
1．解析：feasts　考查名词单复数。结合语境可知，此处特指前文提到的large meals，所以应用复数形式。故填feasts。
2．解析：natural　考查形容词。此处应用形容词修饰名词resource。故填natural。
3．解析：what　考查连接词。分析句子可知，此处是宾语从句连接词，从句缺少宾语，且意为“东西”，指物，应用指物的连接代词。故填what。
4．解析：the　考查冠词。此处特指你厨房里的所有食物，应用定冠词。故填the。
5．解析：heading　考查非谓语动词。此处应用head的动名词形式作为介词before的宾语。故填heading。
6．解析：less　考查比较级。结合上下文可知，此处意为“开始一个不那么浪费的假期”，less wasteful“不那么浪费的”。故填less。
7．解析：be invited　考查语态。主语who和invite之间是动宾关系，应用被动语态，又因will后接动词原形。故填be invited。
8．解析：wisely　考查副词。此处应用副词修饰动词use。故填wisely。
9．解析：as　考查介词。结合上下文可知，此处意为“把它们当作基本原料来用”，use ...as ...“把……当作……来用”。故填as。
10．解析：to produce　考查非谓语动词。根据句意和句子结构可知，此处应填不定式表目的，use ...to do ...“用……来做……”。故填to produce。
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Ⅰ.阅读理解
Students should be able to show what they know.Many folks take this as a self evident truth.But I think it demands closer examination.
Possessing a skill or piece of knowledge is not the same thing as being able to show it.This is why many smart young people hate school.Understanding, figuring out, and getting a handle on a piece of knowledge is really exciting, but having to prove to somebody else that you understand is a_big_fat_pain_in_the_neck．
Finding proof of student learning is a huge part of the teacher's job, and whether it is done poorly or not makes all the difference in that teacher's effectiveness.There is a huge difference between “How do I figure out if this student understands” and “How do I make this student prove to me he gets it.” The first is a valuable approach; the second is the first step on the road toward wasting everybody's time.
And there's the problem.If we start with the assumption that a student knows he is able to show his knowledge to our satisfaction, we will be traveling down the wrong road.The more we demand that students prove to us that they know the stuff, the more we will design artificial tasks that demand a set of skills and knowledge entirely different from the skills and knowledge we really want to measure.
As a classroom teacher, I have to remember that the burden is on me to find a way to see what my students know; the burden is not on them to put on whatever trained monkey show I design for my own ease and convenience.
It may not be the worst thing ever to say “Students should be able to show what they know.” But I think it's far more useful to say, “Teachers should be able to discover what students know.”
【语篇解读】　本文是一篇议论文。文章论述了这样的观点：教师应当能够发现学生是否学到了知识，而不是一味地要求学生展示自己所学的知识。
1．What does the underlined phrase in the second paragraph mean
A．Very dangerous. B．Very annoying.
C．Very difficult. D．Very frequent.
解析：B　词义猜测题。根据第二段中but前面“Understanding, figuring out，and getting a handle on a piece of knowledge is really exciting”可知，理解、弄明白并掌握一项知识确实令人兴奋，但必须向别人证明你已经理解它了，这是一件非常讨厌的事。由此可知画线部分的意思是“非常讨厌的”。故B项正确。
2．According to the third paragraph, a teacher should have the ability to ________．
A．discover whether his students know
B．avoid wasting the precious time in class
C．apply various approaches while teaching
D．give students the chance to prove themselves
解析：A　细节理解题。根据第三段中的“Finding proof of student learning is a huge part of the teacher's job, and whether it is done poorly or not makes all the difference in that teacher's effectiveness.”可知，掌握学生学习的证据(知道学生学到了什么)是教师工作的一个重要组成部分，而这项工作做得如何将对教师的工作效率产生重大影响。由此可知，作者认为教师应当能够发现学生是否学到了知识。故A项正确。
3．What does the author think of the artificial tasks designed to test students' learning
A．They should be limited in number.
B．They are a huge burden on teachers.
C．They should mainly focus on effectiveness.
D．They slide away from their original purpose.
解析：D　推理判断题。根据第四段中的“The more we demand that students prove to us that they know the stuff, the more we will design artificial tasks that demand a set of skills and knowledge entirely different from the skills and knowledge we really want to measure.”可知，我们越是要求学生向我们证明他们知道这些东西，我们设计的人工任务就越需要一套与我们真正想要衡量的技能和知识完全不同的技能和知识。由此可知，作者认为那些为了测试学生的学习情况而编制的任务最终偏离了最初的目的，达不到预期的效果。故D项正确。
4．What is the main idea of the passage
A．Students should be able to show what they know.
B．There are many ways to find proof of student learning.
C．Teachers should be able to discover what students know.
D．There should be better understanding between teachers and students.
解析：C　主旨大意题。通读全文，特别是最后一段中的“Teachers should be able to discover what students know.”可知，本文主要讲的是老师应该有能力发现学生学到的知识。故C项正确。
Ⅱ.完形填空
Concerns about the harm caused by “too much” screen time—particularly when it is spent on social media—are widespread.But working out what a “healthy” ___1___ might be is far from easy.
Some negative experiences on social media—like ___2___ how your appearance compares to others—do affect some children.However, this does not mean that technology use in ___3___ is harmful and it is difficult to make claims about how it will affect different people.
Consider the picture painted by a UNICEF review of existing research into the effects of digital technology on children's ___4___ comfort, including happiness, mental health and social life.Rather than stating that social media was harmful, it suggested a more ___5___ effect.
The UNICEF report highlighted a 2017 study that examined 120，000 UK 15 year olds.Among those teenagers who were the lightest users, it was found that increasing the time spent using technology was linked to ___6___ comfort—possibly because it was important for keeping up friendships.__7__，among the heaviest users of technology, any increase in time was linked to lower levels of comfort.Overall, the UNICEF study suggested that some screen time could be good for children's mental health.
A broader look at evidence provided by some other high quality studies again suggests the story is not ___8___．An early study in 2013 looked at how the television and video game habits of 11，000 UK five year olds affected them two years later.It is one of few studies actually ___9___ the effects of technology over time.It suggested that, compared with children who watched one hour of television or less on a weekday, a small increase in conduct problems was seen among those who watched more than three hours each day.Playing electronic games, however, was not seen as leading to a greater ___10___ of friendship or emotional problems.
So how much time should our children spend looking at screens It is difficult to be ___11___ as different people spend time online in such different ways.A useful comparison might be with sugar.Broadly speaking, people ___12___ that too much sugar can be bad for your health.But the effect it might have can depend on many factors, from the type of sugar to the person and the amount.We would not ___13___ trust anyone who claims to predict how someone is affected by consuming one gram of sugar.The same could be said for ___14___ usage: the outcomes depend on so many factors that only very ___15___ predictions are possible.
【语篇解读】　本文是一篇说明文。文章介绍了社交媒体使用的结果取决于很多因素，所以很难精确地界定一个健康屏幕时间长度。
1．A.amount B．comparison
C．experience D．medium
解析：A　句意：人们普遍担心“过多”的屏幕时间(尤其是在社交媒体上)会造成伤害。但要弄清楚一个“健康”的量是多么的不容易。amount“数量”；comparison“比较”；experience“经验”；medium“媒介”。空前说人们普遍担心“过多”的屏幕时间会造成伤害；再结合下文的研究可知，要弄清楚一个健康的屏幕时间的量很不容易。故A项正确。
2．A.accounting for B．boasting of
C．commenting on D．worrying about
解析：D　句意：社交媒体上的一些负面经历，比如担心自己的外貌与别人的比较，确实会影响一些孩子。account for“导致”；boast of“吹嘘”；comment on“评述”；worry about“担心”。根据空后的“how your appearance compares to others—do affect some children”可知，担心自己的外貌与别人的比较会对一些孩子造成影响。故D项正确。
3．A.general B．particular
C．private D．public
解析：A　句意：然而，这并不意味着(数字)技术的普遍使用是有害的，而且很难断言它如何影响不同的人。in general“通常，普遍”；in particular“特别，尤其”；in private“私下”；in public“当众”。根据常识可知，数字技术是现代社会的人们普遍使用的。故A项正确。
4．A.domestic B．material
C．physical D．psychological
解析：D　句意：想想联合国儿童基金会所描述的关于数字技术对儿童心理安慰的影响的研究，包括幸福、心理健康和社会生活。domestic“国内的”；material“物质的”；physical“体力的”；psychological“心理的”。根据空后的“including happiness，mental health and social life”可知，此处指“心理安慰”。故D项正确。
5．A.complex B．dramatic
C．harmless D．predictable
解析：A　句意：它没有说社交媒体有害，而是表明了一种更复杂的影响。complex“复杂的”；dramatic“引人注目的”；harmless“无害的”；predictable“可预言的”。根据下文对其研究发现的介绍可知，联合国儿童基金会的研究表明社交媒体对儿童的影响很复杂。故A项正确。
6．A.improved B．maximum
C．relative D．small
解析：A　句意：研究发现，在那些最不常使用电子产品的青少年中，增加使用电子产品的时间可能与提高舒适度有关，因为这对维持友谊很重要。improved“改进的，提高的”；maximum“最大极限的”；relative“相关的”；small“小的”。根据空后的“possibly because it was important for keeping up friendships”可知，因为这对维持友谊很重要，所以对那些最不常使用电子产品的青少年来说，增加使用电子产品的时间会提高舒适度。故A项正确。
7．A.As a rule B．In contrast
C．On the whole D．Worse still
解析：B　句意：相比之下，在使用科技产品最多的人群中，任何时间的增加都与舒适程度的降低有关。as a rule“照例”；in contrast“相比之下，与此相反”；on the whole“大体上”；worse still“更糟的是”。根据语境可知，此处是与那些最不常使用电子产品的青少年的对比。故B项正确。
8．A.convincing B．definite
C．probable D．true
解析：B　句意：对其他一些高质量研究提供的证据进行更广泛的研究再次表明，这一说法并不能站得住脚。convincing“令人信服的”；definite“一定的，确切的”；probable“可能的”；true“正确的”。根据下文对2013年的一项早期研究结果的介绍可知，空前说的一些屏幕时间可能有利于儿童的心理健康这种说法是站不住脚的。故B项正确。
9．A.estimating B．experiencing
C．reducing D．tracing
解析：D　句意：这是为数不多的追踪技术的影响随时间变化的研究之一。estimate“评估”；experience“体验”；reduce“减少”；trace“追踪”。空前说2013年的一项早期研究调查了11 000名英国5岁儿童的电视和视频游戏习惯两年后对他们的影响，这说明这项研究追踪了技术的影响随时间变化。故D项正确。
10．A.connection B．power
C．promotion D．risk
解析：D　句意：然而，玩电子游戏并没有被认为会导致更大的友谊或情感问题的风险。connection“连接”；power“力量”；promotion“提升”；risk“风险”。根据空后的“of friendship or emotional problems”可知，此处指“友谊或情感问题的风险”。故D项正确。
11．A.balanced B．independent
C．precise D．subjective
解析：C　句意：那么我们孩子的屏幕时间应该是多少呢？由于不同的孩子在网上花费时间的方式不同，所以很难准确地界定。balanced“平衡的”；independent“独立的”；precise“明确的，精确的”； subjective“主观的”。不同的孩子在网上花费时间的方式不同，所以很难准确地界定孩子健康的屏幕时间的量。故C项正确。
12．A.agree B．forget
C．object D．remember
解析：A　句意：一般来说，人们都认为过多的糖对健康有害。agree“同意”；forget“忘记”；object“反对”；remember“记得”。根据空后的“that too much sugar can be bad for your health”可知，一般来说，人们都会同意过多的糖是对健康有害的。故A项正确。
13．A.equally B．readily
C．reluctantly D．weakly
解析：B　句意：我们不会轻易相信那些声称能预测一克糖对人的影响的人。equally“平等地”；readily“容易地”；reluctantly“勉强”；weakly“无力地”。空前说它可能产生的效果取决于从糖的种类到人以及糖的量等许多因素，所以我们不会再轻易相信那些声称能预测一克糖对人的影响的人。故B项正确。
14．A.emotion therapy B．social media
C．TV broadcasting D．video game
解析：B　句意：社交媒体的使用也是如此：结果取决于如此多的因素，以至于只能粗略地预测。emotion therapy“情绪疗法”；social media“社交媒体”；TV broadcasting“电视广告”；video game“视频游戏”。本文主要讲的就是社交媒体的屏幕时间。故B项正确。
15．A.confident B．optimistic
C．rough D．wild
解析：C　句意参见上题解析。confident“自信的”；optimistic“乐观的”；rough“粗略的”；wild“荒凉的”。社交媒体使用的结果取决于很多因素，所以不能精确地说出一个健康的屏幕时间，只能是粗略地预测。故C项正确。

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