资源简介

(共35张PPT)
Unit 1　
Nature in the balance
Section 2　Language focus on Reading
The Amazon rainforest: a natural treasure
Master the usage of some important words, phrases and sentence patterns.
The text is mainly about the Amazon rainforest, 1．________ is home to a wide range of wildlife.
From the text, we may learn that the Amazon rainforest is 2．______ largest rainforest in the world. It crosses 3．_______ eight countries, all on the South American continent, which is more than half the size of China. More than one in ten 4．________ plant species in the world can be found here, which boasts the richest biodiversity. In addition, 5．_________ as the “lungs of the planet”, the Amazon rainforest produces over 20 per cent of all the Earth’s oxygen, 6．__________ a significant role in maintaining the fine balance of the Earth’s ecosystem.
Activity 1
Quick check and review
复习
which
the
into
known
viewed
playing
Activity 2
Core vocabulary breakthrough
核心词汇突破
Ⅰ 词条讲解
1．harm n. & vt. 伤害，损害
【原句】The human race has done much harm. (page 1) 人类已经造成了很多伤害。
【拓展】
harm n. & vt.→harmful adj.有害的→ harmless adj. 无害的
do/cause harm to … 对……造成伤害
be harmful/harmless to … 对……有害/无害
【即学即练】语法填空
①Large wildfires are ____________(harm) to the air and animals in the Amazon.
②Many colorful insects in the Amazon look scary but are ____________(harm).
harmful
harmless
2．variety n. 不同种类；变化，多样性；变种，变体
【原句】The forest’s different levels support an unbelievable variety of wildlife. (page 3, lines 14–15) 雨林的不同层次使种类多到难以置信的野生动植物得以生存。
【拓展】
vary vi.(根据情况)变化，变更；相异，不同 vt. 变更，改变→various adj. 各种不同的，各种各样的→variety n.
a variety of＝varieties of各种各样的
vary from … to … 在……到……之间变化；从……到……不等
vary in sth在某方面不同
【即学即练】语法填空
①The climate in the Amazon varies _______ temperature ________ hot to mild.
②There are ___________(vary) species of animals living in the Amazon rainforest.
③There is a wide ___________(vary) of animals in the zoo.
in
from
various
variety
3．survive vi. 生存，存活 vt. 幸存，幸免于难
【原句】While a significant number of jaguars survive here, they are only one element of this forest’s food chain. (page 3, lines 23–24) 尽管相当多的美洲豹在这里生存，但它们只是这个雨林食物链的一个要素。
【拓展】
survive vi.& vt. →survivor n. 幸存者；生还者
→survival n. 生存，存活；残存物，幸存事物
survive sb by＋时间段 比某人多活……
survive on … 依靠……维持生活
【即学即练】语法填空/完成句子
①Many animals in the Amazon rainforest survive ______ sweet tropical fruits.
②The _________(survive) rate of the endangered species is very low.
③After the earthquake, many __________(survive) were rescued.
④丈夫死后她又活了十年。
She ______________________ by ten years.
on
survival
survivors
survived her husband
4．impact n. 影响，作用；撞击，冲撞 vi. & vt. 有影响；冲击
【原句】As the impact of human activities continues to grow and the list of species in danger of extinction becomes longer …(page 3, lines 35–37) 随着人类活动的影响不断增加，濒危物种的名单越来越长……
【拓展】
impact n. & vi. & vt.→impactive adj. 冲击的；有不良影响的
have/make an impact (on/upon)(对……)有/产生影响
【即学即练】语法填空/完成句子
①Her father’s death impacted greatly ____ her childhood years.
②种树对自然环境的平衡有着积极的影响。
Planting trees __________________________ the balance of nature.
on
makes a positive impact on
5．damage vt. & n. 损害，伤害，损坏，破坏
【原句】… can we afford to damage the “lungs of the planet”？ (page 3, lines 37–38) ……我们能承担得起损害“地球之肺”的后果吗？
【拓展】
damage vt. & n．→damaging adj. 有破坏性的
do/cause damage to 带给……伤害
damage vt. & n. 损坏，损害(可修复，可见或可评估的，对象是物体或声誉等)
harm vt. & n. 伤害，损害(可修复，抽象的，对象是生物、环境或感情等抽象事物)
destroy vt. 毁坏 (不可修复，突然地、彻底地)
【即学即练】完成句子
①小树需要保护以防止风的破坏。
Young trees need _________________________________ the wind.
②砍伐太多的树木对亚马孙雨林造成了一些损害。
Cutting down too many trees ______________________ the Amazon rainforest.
protecting to prevent damage from
did/caused some damage to
Ⅱ 短语讲解
1．in turn 相应地，转而
【原句】These frogs, in turn, feed on insects which eat leaves and fruit. (page 3, lines 25–27) 相应地，这些青蛙以昆虫为食，而昆虫则吃树叶和水果。
【拓展】
turn n. 转变；转动；弯道；(依次轮到的)机会
take turns to do/doing sth 轮流/依次做某事
by turns (人)轮流(做某事)
in return 作为回报；作为回应
it’s one’s turn to do sth 轮到某人做某事
【即学即练】语法填空/完成句子
①Healthy plants provide food for animals, which _______ turn help spread plant seeds.
②Male and female birds take _______(turn) brooding(孵化) the eggs.
③轮到你摆放餐具了。
_______________ set the table.
④他们轮流打扫教室。
They cleaned the classroom ______________．
in
turns
It’s your turn to
by turns
2．break down 使分解(为)，使变化(成) [拓展义](机器等)出故障，抛锚；(身体、精神)垮掉；坍塌，崩溃；消除；(谈判、计划等)失败
【原句】When a jaguar dies, a tiny army of microorganisms helps break down its body and return the nutrients to the earth. (page 3, lines 27–29) 当美洲豹死后，一小群微生物帮助分解它的尸体，让养分重回土壤之中。
【拓展】
break vt. & vi. 破，碎；弄坏，坏掉；弄破
n. 间歇，小憩；课间休息；停顿，暂停
break away (from) 挣脱(束缚)；脱离
break up (使)分裂；(使)解散；(关系)破裂；(学校)放假
break in 强行进入；突然打断(谈话)，插嘴
break out (战争、打斗等)爆发；突然发生
break through 取得突破；克服
【即学即练】语法填空
①The thief broke _____ and stole the computer and some money.
②The school will break _____ after the examination.
③She broke _______ in tears when she knew the news.
④When did World War Ⅱ break ______？
⑤How can we break __________ the obstacles
in
up
down
out
through
3．breathe life into 给……带来起色，注入活力
【原句】The Amazon rainforest breathes life into the planet by fixing carbon and producing over 20 per cent of all the Earth’s oxygen. (page 3, lines 30–31) 亚马孙雨林通过固定碳，并产生超过全球总量20%的氧气，使得地球生生不息。
【拓展】
come to life 变得活跃起来；生动呈现
bring to life 使苏醒；使生动
【即学即练】完成句子
①新刷的油漆给这个旧房间注入了新的生机。
The new coat of paint _______________________ the old room.
②这位演员在舞台上演活了那个历史人物。
The actor __________________________________ on stage.
③音乐响起时，整个派对顿时活跃起来。
When the music started, the whole party _____________．
breathed new life into
brought the historical character to life
came to life
4．due to 由于，因为
【原句】Over the past 50 years, about 17 per cent of the rainforest has disappeared due to human activities such as agriculture and cattle farming. (page 3, lines 34–35) 在过去的50年里，由于农耕和养牛等人类活动，约17%的雨林已经消失。
【拓展】
be due to do sth预期做某事
owing to由于，因为
thanks to多亏，由于(好的原因)
【即学即练】用上述短语的适当形式填空
①_______________ the bad weather, the picnic has been postponed.
②____________ your help, we finished the task on time.
③His new book _____________ published next year.
Due to/Owing to
Thanks to
is due to be
1．With an area of around 6 million square kilometres, the Amazon rainforest is more than half the size of China. (page 2, lines 5–7) 亚马孙雨林面积约600万平方千米，比中国国土面积的一半还要大。
【句式分析】常见的倍数表达法有以下几种：
(1) A＋be＋倍数＋the size/height/weight/length/width/depth/…＋of＋B
例：This mountain is four times the height of that small one.
这座山的高度是那座小山的四倍。
Activity 3
Analysis and imitation of complex sentences
长难句分析和仿写
(2) A＋be＋倍数＋形容词/副词的比较级＋than＋B
例：My room is twice larger than yours.
我的房间是你的房间的两倍大。
(3) A＋be＋倍数＋as＋形容词/副词原级＋as＋B
例：This tree is three times as tall as that one.
这棵树的高度是那棵树的三倍。
(4) A＋be＋倍数＋what从句
例：The production now is three times what it was ten years ago.
现在的产量是十年前的三倍。
【即学即练】语法填空/仿写
①The population in our region is three times _______ it was 20 years ago.
②我们的新学校是旧学校的三倍大。
_____________________________________________________________________
what
Our new school is three times as large as(/three times the size of) the previous one.
2．While a significant number of jaguars survive here, they are only one element of this forest’s food chain. (page 3, lines 23–24) 尽管相当多的美洲豹在这里生存，但它们只是这个雨林食物链的一个要素。
【句式分析】while作为从属连词时，意为“虽然，尽管”，引导让步状语从句(从句常置于句首)，表示转折。
【即学即练】仿写
尽管我们不能预测未来会发生什么，但我们可以用决心和爱指引自己。(predict)
_________________________________________________________________________________________
While we can’t predict what will happen in the future, we can guide ourselves with determination and love.
Read the examples in B2 on page 5 of the textbook and add more collocations.
Activity 4
Building your language
语言知识拓展
Prefixes Samples Words
un– unbelivable unlimited, unhappy, unknown, unusual, unreal, unfortunate, unlucky, unkind
dis– disappear disagree, disadvantage, dissatisfied, dishonest, disabled
in–/im–/il–/ir– irreplaceable invisible, incorrect, inactive, independent, impolite, imbalance, illegal, irregular, irresponsible
non– non–smoking non–stop, non–existent, non–profit, non–fiction
Ⅰ 语法填空
1．Exercising in polluted air is __________(harm) to the health.
2．The park offers a _______(vary) of activities throughout the year.
3．The application of new scientific discoveries has greatly increased _______________(agriculture) efficiency in our country.
4．Many people in this area have noticeable ___________(region) accents.
5．Located at the foot of the ________(tower) Alps, the Austrian city of Innsbruck offers guests a chance to appreciate a blend of old and new.
Activity 5
Consolidation and feedback
巩固反馈
harmful
variety
agricultural
regional
towering
6．How many species do you believe will be threatened with _____________(extinct) when the reservoir(水库) is completed
7．His _____________ seemed very particular and his ________________ from the party ___________ very strange.(appear)
8．To describe it at _________, you’d better ___________ your report so that the workshop(研讨会) will be a little _________．(long)
9．Luckily, I ___________ the terrible car crash last week and I was the only ___________ of the accident.(survive)
10．I want to thank you in person for the impact you’ve had _____ my life.
extinction
appearance
disappearance
appeared
length
lengthen
longer
survived
survivor
on
Ⅱ 翻译句子
1．我们必须掌握一些基本的技能，这将大大增加我们生存的机会。(It is＋adj.＋that; survive；定语从句)
___________________________________________________________________________________
2．在艺术文化会演中，有各种各样的表演，从唱歌、跳舞到诗歌朗诵不等。(in the course of; vary；定语从句)
___________________________________________________________________________________________________________________
It is necessary that we master some basic skills, which will greatly increase our chances to survive.
In the course of the Art and Culture Show，there are various performances，which vary from singing, dancing to poetry recitation.
3．沉迷于网络游戏对我们的身心健康有害。(be addicted to; harm)
________________________________________________________________________________
4．我的农场已经扩展成了一个大农场，是原来的3倍大。(expand into；定语从句；倍数表达)
_______________________________________________________________________
＝______________________________________________________ _________________
Being addicted to online games is harmful to/does harm to our physical and mental health.
My farm has expanded into a big one, which is three times as big as the previous one.
My farm has expanded into a big one, which is three times the size of the previous one.
1．Try to remember these useful expressions learnt in this class.
2．Finish the exercises on pages 1–4 of Exercise book.

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