人教版高中英语必修3 Unit 4 Astronomy Revision单元复习课件（共17张）

(共17张PPT)
Module3 Unit4 Revision
Astronomy:
Astronomy:
the science of the stars
Words
system, theory, atmosphere, carbon, oxygen, gravity; unlike exist, puzzle, pull, multiply; violent, fundamental, harmful
Phrases
in time, lay eggs, give birth to, in one’s turn, prevent...from, cheer up, now that, break out, watch out, block out
Sentences
This produced a chain reaction, which made it possible for life to develop. (L25,P26)
2) The earth became so violent that it was not clear whether the shape would last or not. (L8,P25)
3) Whether life will continue on the earth for millions of years to come will depend on whether this problem can be solved. (L50,P26)
Dinosaurs, which produced young by _____ eggs,
survived on the earth for more than 140 million years.
laying
1. At the meeting place of the Yangtze River and the Jialing River _____, one of the ten largest cities in China.
A. lies Chongqing B. Chongqing lies
C. does lie Chongqing D. does Chongqing lie
2.She was ill and _____ herself down in bed all day long.　　
A. lay　　　B. lied　　 C. lies　　　D. laid
3. If only he ____ quietly as the doctor instructed, he would not suffer so much now.
A. lies B. lay C. had lain D. should lie
lie 和lay的过去式和过去分词
A
D
C
Dinosaurs, which produced young by laying eggs,
survived on the earth for more than 140 million years.
Mammals, who
___________ young
babies and produced
milk to feed them,
________ on the
earth after the dinosaurs were extinct.
gave birth to
existed
词组: come into existence/ come into being…
对这个问题有不同的观点。
1) There exist many different views on the matter.
2) Opinions on the matter vary from person to person.
appeared
After life came into being
Discussion:
What issues do humans bring to the earth?
. Global warming
. Environmental pollution
. Overpopulation
. Deforestation
. Shortage of resources
…
If life will continue on the earth for millions of years to come will depend on if this problem can be solved.（改错）
Issues on the earth
句型分析：
第一个whether引导的从句类型为主语从句
第二个whether引导的从句类型为宾语从句
What many scientists believe is that the earth may become too hot to live. （改错）
on
Whether
whether
1. 我不知道能否留下.
I can't tell __________________________
whether to stay./whether I can stay or not.
I wonder ___________________________
2. 我想知道是否是好消息.
His father is worried about whether he will lose his work.
3. 他的父亲担心是否会失去工作.
4. 他们是否能准时完成这项工作还是个问题.
Whether they can finish the work on time remains a problem .
只用whether的几种情况
whether it's good news or not .
主语从句
引导词：
连词: that,
whether；
连接代词: who/whom/whose/what/which/whoever等；
（同宾语从句）
连接副词: when/ where/ how/why/whenever/however等。
（同宾语从句）
注：if不能引导主语从句
Subject clause
① Subject clause + verb…
② It + verb… + Subject clause
注：that不能省略
_______?he will be back depends on the weather.
?_______ price will go up is certain.
_______ we go by train or by boat makes no difference.
When /
Whether
That
Whether
_______ matters most in learning English is enough practice.
_______ will write the poem has not been decided yet.
__________ comes?is?welcome.
Who
Whoever
What
* that和whether不充当任何成分，都不可以省略。
* 句子意思确定，用that，不确定用whether
连接词填空
语序陈述；缺啥补啥；词意通达；
prevent…from, cheer up, now that, in one’s turn, come into existence, depend on, in time, block out
Up to now, many mysteries about the universe have been
discovered _________. Meanwhile, new earth issues
________________ as well. What’s worse, people are still
putting too much carbon dioxide into the atmosphere,
which ________ heat ______ escaping from the earth
into space, accounting for the global warming. ________
the earth is becoming warmer and warmer, it is high time
that we should take actions!
in time
prevents from
came into existence
Now that
Problems on the earth
Solutions to the problems
Now that the earth is becoming warmer and warmer, we must promote low-carbon living immediately.
HOW?
现在全世界都在提倡“低碳生活（low-carbon?life）”，即：降低二氧化碳的排放，采取低能量、低消耗、低开支的生活方式。低碳生活对我们大家都有好处，请写一篇120词左右的短文谈谈你的想法你的具体建议以及理由。
Writing
Outline:
1. Brief introduction
of “low-carbon life”
2. Your suggestions & reasons
3. Your wishes
审题—写什么
① In my opinion, it is necessary/essential/emergent to do/that …
② As far as I am concerned, we had better do …
③ As for me, / In my point of view, …
④ I firmly believe that
⑤ I strongly suggest that we should …
⑥ What is the most important is ….
表个人建议的句型：
1、开发新能源
Discovering?renewable?fuels?which?are?cleaner?and?greener
to?take the place of/replace?the?using?of?fossil fuels.
… It is such a significant project that I can’t wait to present my ideas on how to promote it.
2、不用塑料袋
We had better not use plastic bags any more. No one can stand
the “white pollution”. So, it is wise to use bags which can be
reused again and again.
It is emergent to discover/We had better discover …
3、植树造林 …
I strongly believe that we should plant?more?trees?or?other
green plants, in?which?way?we?can?not?only?improve?the
environment, but?also?can?bring?our?home?more?beauty.
4、提高节能意识
1）长明灯—及时关灯，关电脑
2）长滴水—关紧水龙头
3）回收可再生资源，资源再利用
4）开车—走 路或骑车去上班，上学。
We must raise the awareness of saving energy.
There exist many aspects that you should keep in mind.
We ought to turn out the lights the moment we leave,
turn off the tap in time, reuse the?thing?that?can?be?
recycled. Reducing?the?use?of?plastic?bags is also playing an
important role/making a difference.
Now that cars not only cause serious air pollution but also waste energy, we can go to work or school by bicycle or on foot instead of driving.
3. Wishes/summary/call
总而言之，只有当每个人都尽自己最大的努力
才能实现低碳生活，才能防止这个情况恶化,
Only when everyone tries their best can it be possible to
live a lower-carbon life, which can help us prevent the
situation from being worse.
Once?everyone?has?the?sense?of?low-carbon and have the
action?by?themselves, it will be?possible to put the lower-
carbon life into practice.
All in all/In a word/To be short/In brief/ To sum up,
It weighs greatly for all of us to put the low carbon
lifestyle into practice, which will certainly make a
difference to preventing the earth becoming warmer and
warmer.
Finish your writing
Go over the key words and expressions
Homework: