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(共32张PPT)
Unit 13
We are trying to save the earth!
Section A (Grammar focus-4c)
情景式教学语法课公开课
人教新目标版 九年级(下册)
Learning objectives
1.学习本课新词汇：take part in ,afford, turn off, reusable, pay for, take action, transportation
掌握句型: We can’t afford to wait any longer to take action!
Have you ever taken part in an environmental project
We should help save the sharks.
No scientific studies have shown that shark fins are good for health.
The river used to be so clean.
The air is badly polluted.
2. 通过观看视频，能够找出不同事态的句子，通过翻译Grammar focus里的句子，能够说出现在进行时、现在完成时、情态动词、被动语态、used to的表意功能和用法。
3.通过观看视频回答问题能够谈论污染问题，能在实际情景对话中认识解决空气污染和垃圾污染的方法。
Let’s watch the video and pay attention to the grammar of sentences.
Can you find out the sentences in the simple past tense
It was a lovely fresh spring in the meadow.
You found me easily.
Can you find out the sentences in the present progressive tense
What are you looking at
They are dancing through spring flowers.
Can you find out the sentences in the present perfect tense
Little Green Worm has grown.
I haven’t seen one quite like this before.
Can you find out the sentences with modal verbs
You must be the best finder.
I might be.
I can’t see anytihng.
Little Green Worm must have been really hungry.
Read the following sentences and grammar items.
1. We’re trying ______ ______ the earth.
我们正在尽力地拯救地球。
2. The river ______ _____ be so clean.
河流过去常常是如此干净。
3. The air ____ badly ________.
空气被严重地污染了。
4. No scientific studies ______ ____ that shark fins are good for health.
没有科学研究显示鲨鱼鱼鳍对健康有益处。
5. We _____ ______ save the sharks.
我们应该帮助拯救鲨鱼。
to save
used to
is polluted
have shown
should help
What tense can you identify(识别)
We’re trying to save the earth. Present progressive
The river used to be so clean. used to
The air is badly polluted. Passive voice
No scientific studies have shown that shark fins are good for health. Present perfect
We should help save the sharks. Modal verbs
现在进行时的结构和用法(Present progressive)
定义：表示说话时(瞬间)正在进行的动作, 也表示目前或现阶段
正在进行的动作，或说话者的强烈情感。
They are playing basketball now.
Tom is working on a new book .
正在发生
目前一段时间内正在进行
It’s always raining here.
说话者的强烈情感（抱怨情绪
Why are you always coming late for class
含说话者的强烈情感
谓语构成：Be(am\is\are) ＋v-ing (动词的现在分词)
He is watching a movie now.
I am studying Chinese these days.
Do you know the usage of the present progressive tense
标志性词汇：now, right now, look, listen, these days, at the moment,
at present
Look! The boy is crying.
Listen! The boy is singing.
He is watching a movie now.
具体用法：
1.表示说话时正在进行的，目前正在发生的动作。
常带有表示目前时刻的时间状语如：now, at the (very) moment, for the time being, at present, 及Look! Listen! ...
① Look! The big bird is flying away. 看，那只大鸟正在飞走。
② He is watching a movie now. 他现在正在看电影。
2.表示目前一段时间内正在进行，但说话时可能没有进行的动作。
Right now I am studying Chinese by distance learning.
我现在正通过远程教育学习汉语。
Do you know the usage of the present progressive tense
3. 与always, constantly, forever, all the time等副词连用，表示动作反复或习惯。此时句子常含有说话者的强烈情感在内。表达较强的“责备”或“表扬”之意。
① You are always changing your mind. 你总是主意不定(太烦人了。)
② He is always helping others. 他总是帮助别人。(他真是个好人。)
4. 对于come, go, leave, arrive, start 等表示位置移动的动词常可用进行时态表将来。① He is leaving on Wednesday. 他将于周三离开。
② Mary isn’t here at the moment. She is coming later.
玛丽现在不在这儿，她一会儿来。
Group discussion
What a fine day today!
Look! What are they doing
Do you know the usage of the phrase”used to”
We’re trying to save the earth. Present progressive
The river used to be so clean. used to
The air is badly polluted. Passive voice
No scientific studies have shown that shark fins are good for health. Present perfect
We should help save the sharks. Modal verbs
used to的结构和用法
1. used to 是固定结构，是一般过去时的一种形式，后面跟___________. used to do 意为“__________”. 表示过去的习惯动作或状态，现在已不发生或不存在。 可使用于各种人称。
动词原形
过去常常做
sb.used to do sth. 某人过去常常做某事(现在不再做了)
I used to get up at six o’clock. 我以前六点钟起床。
used to be + adj. 过去曾经……样
The river used to be very clean.
used to be + 职业名词 过去曾经当过/是…
His father used to be a teacher.
Do you know the usage of the phrase”used to”
2. used to 的句型变化
1) 否定句式：didn’t use to do sth. e.g.
You didn’t use to eat chips when you were younger.
2) 一般疑问句式：Did + 主语 + use to do sth.
Did you use to play the piano
3) 附加疑问句式： …, didn’t +主语 He used to drink, didn’t he
3. 辨析：used to do sth.; be/get used to doing sth.; be used to do sth.
used to do sth. 意为“过去常常做某事(而现在不做了)”。后接动词原形。I used to eat pork.
be/get used to doing sth. 意为“习惯于(做)某事”。后接动词使用-ing形式。I’m used to riding to school now.
My grandfather is used to going for a walk after dinner.
be used to do sth. 意为“被用来做某事”。这是被动结构，后接动词原形。Wood can be used to make paper.
What voice is it
The air is badly polluted. Passive voice
No scientific studies have shown that shark fins are good for health. Present perfect
We should help save the sharks. Modal verbs
被动语态的结构和用法
1. 定义：主动语态表示主语是动作的执行者。被动语态表示主语是
动作的承受者，即行为动作的对象。
2. 结构：be + 过去分词 e.g. A new school was built last year.
Our classroom is cleaned every day.
3. 主动语态如何变为被动语态
①
②
③
小口诀： 宾变主，主变by+宾，谓语动词用被动（be+done）,其他成分不变。
I cleaned my room. → My room was cleaned by me.
Do you know about the passive
主动语态中有些感官动词（如hear, see, watch, notice等）和使役动词（如make, let等）后用不带to的不定式作宾语补足语，变为被动语态时，要把不定式符号to还原。
I saw him cross the road and enter the shop.
→ He was seen to cross the road and enter the shop.
a. 讲话者不知道动作的执行者，不必或不便说出动作的执行者（这时可省掉by引导的短语）;
b. 借助被动的动作突出动作的承受者
4. 被动语态用法:
Tea plants are grown in South China.
A new school was built last year.
被动语态的基本结构：助动词be + 及物动词的过去分词
不同时态的被动语态结构(以动词do为例):
一般现在时: am/is/are+ done
一般过去时: was/were+done
一般将来时: will be/is(/am/are) going to be+ done
含情态动词: can/may/must...+be+done
The Entrance Exam ______(hold) in June every year.
is held
A strange noise ________ (hear) by him last night.
was heard
A wide road __________ (build).
will be built
Actions should________(take) to protect
the earth.
be taken
Do you know the usage of the present perfect tense
The air is badly polluted. Passive voice
No scientific studies have shown that shark fins are good for health. Present perfect
We should help save the sharks. Modal verbs
现在完成时的结构和用法
1.定义：表示现在还存在过去发生或已经完成的动作的影响或结果;
或者表示从过去某一时间开始一直延续到现在并还可能持续下去的动作。
2. 结构: has/have + 过去分词
3. 标志词: already, yet, ever, never, just, before, once, twice, recently,up to
now, till now, so far, for+时间, since+时间点/从句, in the last/past...years。
I haven’t finished my homework yet.
I have already finished reading the book. 我已经读完这本书了。
He hasn’t called since he went to Beijing.他自从去了北京还没有打来过电话。
He has kept this book for two weeks. 他借这本书两周了。
Her grandfather has been dead for ten years.
In the past few years, great changes has taken place in Lianyungang.
Do you know the usage of the present perfect tense
The air is badly polluted. Passive voice
No scientific studies have shown that shark fins are good for health. Present perfect
We should help save the sharks. Modal verbs
4. 现在完成时的句式结构: 主语+have / has（助动词）+ done
肯定句：主语 + have / has + done+ 其他
否定句：主语 + haven’t / hasn’t + done + 其他
一般疑问句： Have / Has + 主语 + done+ …？
肯定答语：Yes, 主语 + have / has.
否定答语：No, 主语 + haven’t / hasn’t.
5. 过去分词的构成
一般情况下，在动词后加-ed。如: work → worked。
在以e结尾的动词后只加-d。如: close → closed。
以辅音字母加y结尾的动词，应将y改为i再加-ed。如: study → studied。
以重读闭音节结尾的动词，要双写末尾的辅音字母再加-ed。
如: stop → stopped。
过去分词的规则变化
Do you know the usage of the present progressive tense
5. 过去分词的构成
过去分词的不规则变化
AAA型 put put put
AAB型 beat beat beaten
ABA型 become became become
ABB型 get got got/gotten
ABC型 begin began begun
6. 辨析：have been to, have gone to & have been in
have / has been to “曾经去过某地”, 现在已经不在那里了。
一般与表示频率的副词或次数连用。
I have been to Beijing twice.我去过北京两次了。(已经回来)
have / has gone to “到某地去了”, 表示到了某地或正在去某地的途中, 即说话时该人不在现场,
My mom has gone to the supermarket.我的妈妈去超市了。(人不在现场)
have been in 已在某地, 常与表示一段时间的状语连用。
I have been in Beijing for two years.
Do you know the usage of the modal verbs
The air is badly polluted. Passive voice
No scientific studies have shown that shark fins are good for health. Present perfect
We should help save the sharks. Modal verbs
情态动词的结构和用法
1. 情态动词本身有一定的词义, 表示说话人的情绪、态度或语气, 但
不能单独作谓语, 只能与其他动词构成谓语。常见的有: can (could),
may (might), must, need, shall (should), will (would)等。
2. 情态动词无人称和数的变化，后接动词原形。否定式是在情态动词后面加not。个别情态动词有过去式形式，可用来表达更加客气、委婉的语气。Ken can climb up the trees like a koala.
Tracy could ride a bicycle when she was five years old.
You mustn’t play with fire. It is dangerous.
Do you know the usage of the the modal verbs
3. 情态动词的用法
a. 表能力: can, could, be able to
情态动词can表示“能力”时，与be able to同义，否定形式为can’t。
can 表示现在的能力，其过去式could表示过去的能力。
—Can your Australian friend eat with chopsticks
— Yes, but she can’t use them well.
—Could your father play golf when he was young
—No, he couldn't. But he could play table tennis.
b. 表推测: might, could, may, can, must, can’t (可能性依次递增)
might, may, can, must都可表示“推测”， may和must表“推测”常用语肯定句，can表“推测”常用于否定句和疑问句。
After a long walk, the children must be very tired now.
—I saw Lily in the supermarket this morning.
—No, it can't be her. She moved to Australia the day before yesterday.
Do you know the usage of the modal verbs
c. 表建议: shall, should, had better
You should study hard if you want to be a scientist in the future
You had better ask your parents for advice.
d. 表委婉的“请求；许可”: may, might, can, could, will, would
当“May\Can\Could I …”表示“请求；许可”时，could在表示“请求；许可”时，语气更委婉。肯定回答常用“Yes,please.”\“certainly”
等，否定回答常用“No, you can’t.”等。
—May I borrow your math book — Sure. Here you are.
—Could I watch Tv now — Sorry. you can't.
e. 表义务: must, need, have to
I must study hard and get good grades.
must 意为“必须”，强调主观看法。
It's raining outside. I have to stay at home.
have to 意为“不得不，必须”，强调客观情况
Enjoy a short video and anwer the questions.
1. What’s happening to the earth
2. What caused the pollution？
3. What should we do to reduce the pollution？
It is suffering from pollution.
遭受(痛苦)
People are throwing rubbish everywhere.
Factories are putting waste into the river.
The factories that burn coal pollute the air with a lot of black smoke.
Do you know how to protect the environment
3. What should we do to reduce the pollution？
The government has taken actions.
Some laws are developed to stop the pollution.
Everyone should take part in saving the earth.
Take the bus or ride a bike instead of driving.
Do you know how to protect the environment
bring a bag instead of plastic bags when shopping.
Remember to throw rubbish into the bins.
Try to put different kinds of waste into different bins.
Complete the exercise.
4a
Fill in the blanks with the correct forms of the verbs in brackets.
Joe: _____ you ever _____ (take) part in an environmental project
Ken: Yes, I have. I _______ (help) with a Clean-Up Day last year.
It was __________ (consider) the biggest clean-up project
this city______ ever ________ (have).
Joe: How many people ________ (take) part
Ken: I ___________ (think) more than 1,000 people ______(come) to help out.
Joe: That’s fantastic! I guess everyone in this city is ______ (try) to improve the environment.
Ken: Yes, we can’t afford to________ (wait) any longer to take action!
Have
helped
considered
had
had
took
think
came
trying
wait
take part in sth/doing sth 参加
afford to do sth 负担得起
take action 采取行动
taken
Complete the exercise.
4b
Fill in the blanks with the appropriate modal verbs from the box.
can
would
could
have to
should
must
may/
might
People _________ think that big things__________________ be done to save the earth. Many forget that saving the earth begins with small things. For example, you ______________ save electricity by turning off the lights when you leave a room. You _______________ also use reusable bags instead of plastic bags. I think it’s a great idea that you now _______ pay for plastic bags in some stores. And instead of driving to school or work, you _______________ ride your bike or walk. If it’s far, you __________ take the bus. All these small things __________ add up and become big things that ______________ improve the environment. Let’s take action now!
may/might
should/have to/must
can/could/should
can/could/should
have to
can/could/should
can/could
can/could
would/can/could
pay for 付费；付出代价
add up 合计；加起来
Complete the exercise.
4c
Make a list of things that people can do to help the environment and discuss your list with your partner.
use public transportation (n.交通运输); …
I think that everyone should use public transportation.
I disagree. It’s difficult for parents with young children to use public transportation…
Let’s have a class test.
一、用所给词的适当形式填空
1. The old man used _____ (be) a teacher.
2. We should _____ (clean) the room every day.
3. Look! Tom _____________ (sleep) in his room.
4. Lots of trees _______________(plant) on the hill every year.
5. He _________ (live) here for 20 years.
to be
clean
is sleeping
are planted
has lived
Let’s have a class test.
二、根据所给汉语完成英语句子。
1. 这条河过去很干净。
The river _______ _______ _______ so clean.
2. 我们应该帮助拯救鲨鱼。
We should _______ _______ the sharks.
3. 然而，很多人忘记了拯救地球从小事做起。
However, many forget that saving the earth______ ____ small things.
4. 在很多商店，你不得不付塑料袋的费用
In some stores, you now have to ___ _____ plastic bags.
5. 我们认为每个人都应该使用公共交通工具。
We think that everyone should use __________ _________.
used to be
help save
begins with
pay for
public transportation
Homework
1. 熟记Grammar Focus 里面的句子。
2. 熟读Section B P101对应的单词；
预习课本P101，完成1a.
谢谢
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Unit 13 Section A Grammar focus-4c 学案 (知识精讲+分层作业)
【词汇用法】
1. take part in an environmental project参加一个环境项目
2. afford to do sth.负担得起做某事
3. take action 采取行动
4. help out 帮忙
5. that’s fantastic! 太棒了！
6.take action to do sth. 采取行动做某事
7.begin with 以...开始
8.pay for付费；付出代价
9.add up加起来
【词汇用法】
can/ can’t afford sth. 能/不能负担得起
Can/ can’t afford to do sth. 能/不能承担做某事
Eg: He can’t afford this house.他买不起这个房子。
He can’t afford to wait any longer. 他不能再等了。
【重点语法】
现在时态
现在时态包括三种时态：一般现在时、现在进行时和现在完成时。
1. 一般现在时
(1)表示客观真理。如：
The earth revolves around the sun.
地球绕着太阳转。
(2)表示长期存在的情况。如：
He likes music very much. 他很喜欢音乐。
(3)表示经常发生的动作或存在的状态。如：
He often visits his grandparents.
他常看望他的爷爷奶奶。
注意：(1)一般现在时也可以表示将来的动作，强调计划的不可改变性。如：
The train leaves at 3 p．m.this afternoon.
这辆火车在今天下午三点出发。
(2)在时间和条件状语从句中，必须用一般现在时表示将来的动作。如：
If it rains tomorrow, we won't go out.
如果明天下雨，我们就不出去。
2. 现在进行时
(1)表示现在正在进行的动作。如：
①It is raining heavily now.现在正在下大雨。
②My mother is cooking in the kitchen.我妈妈正在厨房做菜。
(2)表示近期打算的动作。如：
①I'm meeting my teacher tonight.今晚我要去见我的老师。
②He is leaving for Beijing next week.他下周要去北京。
(3)表示反复进行的动作(往往带有感彩)。如：
①You are always making the same mistake.你老是犯同样的错误。
②She is always talking about you.她总是谈论你。
注意：有些动词不宜用进行时态，如：like, want, believe, know等。
3. 现在完成时
(1)表示反复的动作对现在的影响。如：
I have seen the movie five times.这部电影我看过五次了。(对这部电影我已经很熟悉了)
表示过去的动作对现在的影响。如：
I have been to England before.我以前去过英国。(现在可能不想去英国了)
(3)表示过去发生的动作，现在仍未结束，还在延续。如：
He has studied English for five years.他学习英语五年了。(现在还在学习)
注意：(1)现在完成时态强调对现在的影响，而一般过去时态强调过去，与现在没有关系。如：
①He opened the window this morning.
今天早上他打开了窗户。(仅仅叙述早上的情况)
②He has already opened the window.
他已经打开窗户了。(说明现在窗子是开着的)
(2)常和现在完成时连用的时间状语：already, yet, ever, never, before, so far, up to now, since then, in/over the past/last few years, in recent years, just等。
【重点句型】
1. Many forget that saving the earth begins with small things.
很多人忘记了拯救地球是从小事开始的。
All these small things can add up and become
big things that can improve the environment．
所有的这些小事加起来，就变成了能改善环境的大事。
We can’t afford to wait any longer to take action!
我们承担不起继续等待而不采取行动！
afford v. 承担得起; 买得起; 提供, 给予
afford to do sth. (常与can, be able to连用) 买得起; 负担得起；有能力做某事 / 负担得起做某事 多用于否定句或疑问句。
afford sth. 买得起 / 承受得起某物
Can you afford the mobile phone
We can’t afford to pay such a price.
e.g. We can’t afford to pay such a price.我们付不起这个价钱。
They can’t afford to send their children to college.
Dancing affords us pleasure. 跳舞给我们带来快乐。
afford & buy
afford侧重“有经济能力买”，而buy则侧重“购买(这一行为)”。
表示“我买不起……”可以说I can’t afford ...，但不能说I can’t buy ...。
1) They can’t afford to send their children to college.
2) Can you afford a new car
3) Helen bought some fruit on her way home yesterday.
… save electricity by turning off the lights when you leave a room.
turn off 关掉
e.g. Please turn the television off before you go to bed.睡觉前请关掉电视。
拓展: turn相关短语
turn on 打开, 发动
turn around 转身
turn up 调高(音量)
turn down 调低; 拒绝
turn into 变成; 进入
turn over 移交
5.Have you ever taken part in an environmental project
take part in 参加
take part in多指参加会议或集体性的工作或活动，且参加者在其中发挥一定的作用。
Li Lanjuan headed for Wuhan and took an active part in the battle.
单项选择
( )1.Shopping used to 　　　going to shops, but nowadays,you can do it online at home.
A. means B. meant C. mean D. meaning
( )2.—What great progress HUAWEI　　　 in recent years!
—No wonder it is widely known in all parts of the world.
A. is making B. has made C. makes D. made
( )3.Now waste from daily life in the city of Shanghai 　　　　to be separated into four different groups.
A. is requiring B. is required C. was required D. required
( )4.—Many people play with mobile phones all day instead of reading books.
—That's too bad. Everyone 　　　be a book lover. Reading is more enjoyable.
A. may B. must C. would D. should
( )5.—The number of tourists　　　 over 33 million this year.
—Yes. A large number of tourists　　　 so far because of the new look of our city.
A. is; have come B. is; has come C. are; has come D. are; have come
二、用所给单词的适当形式填空
6. Bill __________(read) picture books with his dad now.
7. They used ________(live) here. But they ________(move) to Chengdu last month.
8. We ____________(know) each other since we were children.
9. The library ______________(complete) in 2018.All the students liked it.
10.The magazine must _______(be) Nancy's. Her name is on its cover.
三、完成句子。
11.她过去常常周末和朋友闲逛。
She _____________________ with friends on weekends.
12. 他习惯于每天晚上睡得很晚。
He _____________________________at night.
13.我们应该立刻行动起来,帮助他们摆脱困境。
We should 　　　　 　　　　right now to help them out of the difficulties.
14.你愿意参加世界读书日的活动吗
Would you like to 　　　 　　　　　 　　　　the activities of World Book Day
15.如果你打破这个杯子,你必须赔偿。
You’ll have 　　　　 　　　　 　　　　it if you break the cup.
四、完形填空
On a trip to Japan with her family in 2019, Sasha Olsen was surprised at the ocean’s pollution levels. There, she saw　16　 sea animals.
“We went on this trip and at first I was so excited,” said Sasha. She is 10 years old and lives in Florida. “But when I saw the ocean, I got　17　. I wanted to know why things were this way but couldn’t find a(n)　18　.”
Sasha　19　the help of her cousin, Narmina, who is 23 years old and got a college degree in business. Together, they　20　 a group “I Want My Ocean Back”. Friends in the group got together on weekends to clean the beaches. As time goes on, the group is doing different things to further protect the ocean. For example, the group has done something to　21　 money, which will be used to clean up the beaches. It will also go to conservation groups such as Oceana and World Wildlife Fund(WWF), because they work to　22　 animals and their environments.
Also, Sasha invited local people to take part in an activity called “Kids Love the Oceans”. There, she spoke about the oceans’ problems. People made art out of rubbish collected from the　23　 and they felt moved to share the moment. “Sasha has　24　 many other kids to join the group and showed people that we’re able to make a　25　,” Narmina said.
Sasha and Narmina hope to go on their work to neighboring cities. Hollywood is near.
(　　)16.A.interesting B.living C.dying D.moving
(　　)17.A.quiet B.well C.peaceful D.disappointed
(　　)18.A.answer B.plan C.excuse D.lesson
(　　)19.A.passed on B.asked for C.turned down D.laughed at
(　　)20.A.left B.found C.started D.forgot
(　　)21.A.waste B.raise C.spend D.pay
(　　)22.A.feed B.protect C.refuse D.hurt
(　　)23.A.beaches B.streets C.schools D.factories
(　　)24.A.warned B.doubted C.influenced D.ordered
(　　)25.A.trip B.mistake C.mess D.change
五、阅读理解
Zhalong National Nature Reserve is a nature park in Heilongjiang in Northeast China. It is one of the world’s most important wetlands. The area provides food and homes for wildlife. It is an ideal home for different kinds of plants, fishes and birds.
Many birds live comfortably in Zhalong National Nature Reserve all year round, while some only stay for a short time. There are many fish in the wetlands, and the birds can easily catch them for food. Zhalong National Nature Reserve is an important living area for the rare red-crowned cranes. There are not many red-crowned cranes in the world. Some of them live in Zhalong National Nature Reserve.
Some people want to change the wetlands to make more space for farms and buildings. This means that there will be less and less space for wildlife.
More and more birds are in danger because they do not have enough living space. Many of them died. The Chinese government wants to protect these endangered birds, and they can be safe in Zhalong National Nature Reserve. If we don’t protect them, they might disappear from the earth.
Every year a lot of tourists go to Zhalong National Nature Reserve to watch birds. This year members of our Bird Watching Club are going to study the different kinds of birds in Zhalong National Nature Reserve and the changes in their numbers. The study will begin next month.
We do a bird count once a year. We are now inviting another school’s students to help. We need more people to help us count the birds and do something to help the birds. Many people do not understand the importance of the wetlands. We hope this information will help them understand it and make them actively take action to protect wildlife.
( )26. Which of the following sentences is NOT TRUE
A. There are a lot of red-crowned cranes in other parts of the world.
B. Some birds go to Zhalong National Nature Reserve for a short stay.
C. Zhalong National Nature Reserve is the comfortable home of many birds.
D. Birds can find food without difficulty in Zhalong National Nature Reserve.
( )27. Why are more and more birds endangered
A. Because many tourists watch them.
B. Because many of the birds died.
C. Because people have fewer and fewer places.
D. Because their living space is less and less.
( )28. What does the underlined word “endangered” mean in Chinese
A. 绝种的 B. 濒危的 C. 繁殖的 D. 食草的
( )29. This passage is written to_________.
A. ask people to do something for birds
B. help people learn about protecting wildlife
C. make people understand how important the wetlands are
D. ask students all over the world to watch birds
六、六选五
Pollution inside homes and other buildings kills more than 4 million people each year. 30.　　　　 ___________. One way to reduce the number of deaths is through cooking equipment(设备) powered by the sun. Crosby Menzies, a solar(太阳的) power expert, described his latest solar cooker called the “Sol-4”. “It is four square meters of mirrors, six to eight meters in length. 31.　　　　”
The Sol-4 works by reflecting light from the sun in large mirrors. The mirrors direct the light at a cooking pan. 32.　　　　 Within two minutes, the pan is hot enough to cook onions. In just four minutes, water can be boiled. That is as fast as cooking with natural gas or electricity.
The cooker is also much “friendlier” than other models. 33.　　　　 People can prepare meals without having to collect firewood or spend money on coal. Such people would be less likely to have breathing illnesses from harmful smoke.
At present, the cooker only works when the sun is shining. But engineers are working on a way to make it work without sunlight.
Each cooker costs about $2,000. 34.　　　　 To solve that problem, Crosby Menzies has created an organization called Solar Cookers for Africa. It plans to raise money to provide poor people with solar cooking equipment.
A.It is quite a large cooker.
B.Most Africans can’t afford it.
C.Then the light heats the pan with solar energy.
D.People do not have to stand in the sun to use it.
E.The African government will provide poor people with solar cookers.
F.Many people die from cooking over wood-powered or coal-powered stoves.
30._________ 31._________ 32._________ 33._________ 34._________
Unit 13 Section A Grammar focus-4c 学案 (知识精讲+分层作业)参考答案
一、单项选择
1-5CBBDA
二、用所给单词的适当形式填空
6. is reading 7. to live ; moved 8. have known 9. was completed 10. be
三、完成句子
11.used to hang out　 12.is used to staying up 13.take action　 14.take part in 15.to pay for
完形填空
16-20CDABC 21-25BBACD
阅读理解
26-29 ADBC
六选五
30-34FACDB
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