Unit 4 Global warming

课件19张PPT。Unit four Global warmingwarming up and reading :
Do you know our planet is becoming warmer ? Why and how ?
What ‘s the effect ? Discuss the questions.Where can I go ?answers may be differentMore and more pollutions, especially waste gases are the main cause.
Factories , cars and power stations give out smelly gases including carbon
dioxide, and these waste gases have an extremly bad effect on the earth
which is known as greenhouse effect. Greenhouse effect can cause our
planet' s temperature to rise.
Do you want to know how?
1. An energy source is renewable when supplies of it never run out.
For example _______________ __________ and _____.

While a non-renewable one will run out one day.
For example ___________, __________and ______.
Solar energy Wind energyWater powercoaloilnatural gasA green house is made of glass . The air inside was______ because the glass
traps the _____ from the sun and keep it from escaping. This makes the greenhouse
heat_____.
In the atmosphere surrounding the earth there are gases called greenhouse gases,
Including ___________,___________and water vapor.
warmheatupCarbon dioxidemethaneFast reading: try to find the main idea of each part
Part one (para.1) two attitudes between scientists to global warming
Part two(para.2-5) the reason why global warming comes about
Part three(para.6) a brief introduction about global warming and if it is matter
Part four(para.7) what shall we do in the future about global warming
Careful reading: true or false questions
The temperature in the 20th century seem to increase much
All scientists believes that global warming is due to the activities of man.
Janice Foster thinks that she can measure the future temperature .
George Hambley thinks global warming is not a bad but good thing.
There are two different opinions between scientists about the effects
of global warming
6. The writer tells us what the effects of global warming will be in the future.
falsetruefalsetruetruefalseFill in the blanks according to the text.
The temperature of the earth ______上升about one degree Fahrenheit, which doesn't
seem much to you. But when_______跟比to other natural changes it is a rapid increase
.
How has this _______ 发生and does it ________要紧?
All scientists ________ 同意the view that the increase in the temperature is _______
由于the burning of fossil fuels like coal,natural gas and oil to produce energy.
The problem begins when we add huge ________大量的extra carbon dioxide into the
atmosphere. It means that more heat energy ______倾向to be trapped in the atmosphere
causing the global temperature to ______上升。
All scientists agree that it is the burning of more and more fossil fuels that has
__________________导致this increase in carbon dioxide.
rosecomparedcome aboutmattersubscribe todue toquantities oftendgo upresulted in课文语言点讲解：
1. How has this come about and does it matter?
come about: 发生；造成 不及物动词
e.g . How did the accident come about (=happen)?
How did it come about that he finished his work two hours late?
(How did it come about that...固定句式）
翻译：
1. 他被老师惩罚了，但我不知怎么回事。
2. 火车晚点是怎么回事？
true or false question:
1. Do you know how it came about that he was hit on the head?
2. How was it came about? Nobody could tell me.
He was punished by his teacher, but I didn't know how it came about.How did it come about that the train arrived late.truefalse. was---did扩展：come on/come along/come out/come up with2. The problem begins when we add huge quantities of extra carbon dioxide into the
atmosphere.
quantities of 大量的
E.g. Quantities of money of him are given to the earthquake-stricken area.
Quantities of books are bought to replace the old ones in the library.
但是：A large quantity of money is given to them.
A large quantiti of books is bought by them.
即：quantities of 可以修饰可数和不可数名词，但谓语总是用复数。
a quantity of可以修饰可数和不可数，但谓语总是用单数。
类例： a large amount of 和 amounts of
ex. 1. Large quantities of people ______(be) now crowding into the major cities.

2. There _____(be) a quantity of water polluted by the factory.

3. The food is good enough in ______(quantity)but not in quality

areisquantity很special的短语哟3. ...causing the global tempetature to go up
go up （温度，价格，水位的）上升
e.g. The price of the house is going up , which is unacceptable.
Every time cigarettes go up in price, he decides to give up smoking.
People began to move away from the area when the water level went up.
练习： People felt stressed with the housing price_________ (go up)
4. There are those who are opposed to this view and believe we should not
worry about high levels of carbon dioxide in the air.
be opposed to sth or doing sth. 反对…
oppose （doing） sth
e.g. The guide was opposed to staying there long.
All the others are opposed to your proposal .
going upGot it? with 结构。 注意词形哟！练习：His parents are opposed to _______ 他去abroad on his own.
5. … it will encourage a greater range of animals…
a range of 排列，连续， 系列
e.g. a range of mountains 山脉/ a wide range of books 各种不同的书
range from...to...在...范围内变化
e.g. The children range from 8 to 12.这些孩子从八岁到十二岁不等。
练习：互译
1. The frontier of the country ranges from the northern hills to the southern
coast.
2. 有六岁到十二岁的五十个孩子。
his staying懂了！ be opposed to doing sth. 此处是动名词的复合结构即：sb's doing这个国家的边界从北方的山脉到南方的海岸都有。There are 50 children ranging from six to twelve. 注意词形6. On the whole the warming of the earth is a phenomenon that causes...
on the whole: 大体上，总的来说
e.g . On the whole I agree with what you say.
as a whole: 作为一个整体
e.g As a whole our class is like a family.
7. I am doing a project on behalf of my school...
on behalf of sth/ sb. 代表某人或某个组织
e.g. I really feel grateful to you on behalf of my family.
练习：
1.大体上而言，他所作的是正确的
2. 他代表我们学校做了报告。
On the whole what he has done is right.He gave a lecture on behalf of our school.8. we don't have to put up with pollution
put up with sb/ sth容忍某人或某事
e.g. I couldn't put up with his rudness any more.
He is a man with lots of words , which is hard to put up with.=He is hard to put up with
because he is so noisy.
扩展： put away 收起放好/ put aside 储蓄，存备用/ put forward 提出/put off
推迟put on 上演 / put out 扑灭9. ...if circumstance allow you to.
circumstance 常用复数“情况；环境”
e.g. He had to give up smoking due to the circumstances.
under/in no circumstances:决不
e.g. Under no circumstances shall I give up.注意，放在句首要倒装！回顾练习：
短语：
1. 发生
2.同意；赞成
3. 大量的
4. 上升
5. 导致
6. 反对
7. 即使
8.容忍
9. 一系列10. 决不
11. 平均来说
12.继续
13. 大体上
14. 作为一个整体
15. 代表
come aboutsubscribe toquantities ofgo upresult inbe opposed toeven ifput up witha range ofunder no circumstanceson averagekeep onon the wholeas a wholeon behalf of本单元语法： it的练习
一. 基础练习
1. They bought a new house, but___ will need a lot of work before they move in.
A. they B. it C. one D. which
2. I was disappointed with the film. I had expeted____to be much better.
A. that B. this C. one D. it
3. Does ___matter if he can't finish the job on time?
A. this B. that C. he D. it
4. Was ____ that I saw last night at the concert?
A. it you B. not you C. you D. that yourself
5. In fact ____is a hard job for me to keep order.
A. this B. that C. these D. it
6.______your children have entered without permission.
A. There seems that B. It seems to be C. There seems to be D. It seems that
7.I really like____here. Everything here is quite different. A. it B. them C. that D. that
√√√√√√√8. come and see me when________.
A. you are convenient B. you will be convenient C. it is convenient D.it will be
conenient to you
9.I don't mind her criticizing me, but ___is how she does it that i object to.
A. it B. that C. this D. which
10.I think ___useful to listen to English programs on the radio.
A. this B. that C. its D. it
11. We feel ____our duty to make the earth a better place to live on.
A. it B. this C. that D. one
12. Why don't you bring ___ to her attention that you have finished your work?
A. that B. it C. this D. her
13. -Did you find your watch yesterday?-No, I didn't find___, but I have bought___.
A. it; it B. one; it C. it; one D. one; one
14. -When shall we meet again?-Let's make ___next Sunday.
A. that B. it C. one D. this√√√√√√√二. 对比练习
1. (1).His mother kept telling him that he should work harder, but ___didn’t help.

(2).His mother kept telling him that he should work harder,_____ didn’t help.
A. he B. which C. she D. it
2. (1).--He was nearly drowned once.—when was____?
---_____was in 1988 ____ he was in middle school.
A. that; It; when B. this; This; that C. this; It; that D. that; This; when
(2).—He was nearly drowned once.—when was ____?
--_____was in 1988 when he was in middle school ____he was nearly drowned
.
A. that; It; that B. this; This; that C. this; It ; that D. that; This; when
DB√√3.(1).___is known to all, the moon travels around the earth.
(2).____is known to all that the moon travels around the earth.
(3)._____is known to all is that the moon travels around the earth.
A. It B. As C. That D. What
4.(1).Someone is knocking at the door. Go and see ____.
(2).Tell me _____that is knocking at the door ?
(3)._____that is knocking at the door? A. who is he B. who he is C. who is it
D. who it is
5. (1). He was given lots of work,most of ____ was difficult to do.
(2). He was given lots of work and most of ____ was difficult to do.
A. which B. it C. them D. that
BADDDCABThank you!