Class __________ Name __________
一、Fill in the blanks.
1. Why does cutting down trees make the greenhouse effect worse? ( )
A. Because trees take in CO2 and produce O2.
B. Because trees take in O2 and produce CO2.
2. What are the results of cutting down forests? ( )
A.It destroys the homes of animals that live in forests.
B.It causes the surface of the soil to be easily destroyed by rain.
C.It can result in floods and even more damage to the environment.
D.All of the above.
二、Do “T”or “F”.
1.People often use things for one time and then throw them away, or leave them on the ground as litter. ( )
2.Our bad habits will not create mountains of rubbish and pollutes our land and seas. ( )
3.We should recycle as many things as we can. ( )
4. A green consumer is a consumer who wears green clothes. ( )
三、Do a survey
(1)Do you recycle
A. newspapers? 1
B. plastic bags? 1
C. Both 2
(2)When you make a short journey, do you
A. walk or cycle? 3
B. go by car? 0
C. go by public transport? （公共交通） 2
(3)What do you use for shopping?
A. A basket or a cloth bag. （布袋） 3
B. Reused plastic bags. （重复使用的塑料袋） 1
C. New plastic bags. （新的塑料袋） 0
(4)Do you often play computer at home?
A. Usually. 0
B. Seldom. 1
C. Never. 2
(5) How often do you switch off the lights and other electrical appliances（电器） when they are not needed?
A. Usually. 2
B. Seldom. 1
C. Never. 0
(6)Do you usually take
A. a bath? 0
B. a shower? 1
总分：__________
课件41张PPT。drought 干旱flood 洪水tsunamis 海啸 Read it out担心；忧虑
大气层
温度；气温
消费者
猜测
环境保护的；赞成环境保护的
无生命的；无生物生长的
燃料
煤
结果
（使）增长；增多；增加concern
atmosphere
temperature
consumer
guess
green
lifeless
fuel
coal
result
increase海平面
摧毁；毁灭
自然界；大自然
表面；表层
土壤
洪水；水灾
习惯
正确的；恰当的
无害的
回收利用
目的；用途sea level
destroy
nature
surface
soil
flood
habit
proper
friendly
recycle
purpose温室效应
在危险中
由于
造成；导致
许多；大量
采取行动
有作用；有影响greenhouse effect
in danger
as a result of
result in
mountains of
take action
make a differenceI want to show you a video.What can you see?
We can see pollutions and natural disasters.What’s your feeling?
I am feeling …
U3 The world is in danger How many problems does the article discuss?
what are they? The greenhouse effect, cutting down forests and bad habits.Three.Look at the pictures ,the title and the sub-headings（副标题）, Answer this question. （回答问题）greenhouse effect
What result?What cause?是什么？结果？What?什么导致？L4-8L19-23L11-18The world is in danger
Our world is in danger. We must do something to protect the environment. But, what are the main problems we face?
The greenhouse effect
The atmosphere around the Earth is necessary for all living things. It is like the glass of a greenhouse, letting sunlight in and keeping heat from getting out. Without it, the Earth would be the same as the Moon—cold and lifeless.
When we burn fuels such as petrol and coal, we produce a gas called carbon dioxide (CO2). Too much of this gas pollutes the atmosphere, and causes it to keep in too much heat. As a result of the greenhouse effect, the Earth’s temperature is increasing. This causes sea level to rise, and in the future may cause cities to disappear.Read the first part of the text and answer three questions.什么是温室效应？
温室效应(英文：Greenhouse effect)，又称“花房效应”，是大气保温效应的俗称。大气能使太阳短波辐射到达地面，但地表向外放出的长波热辐射线却被大气吸收，这样就使地表与低层大气温度增高，因其作用类似于栽培农作物的温室，故名温室效应。温室有两个特点：温度较室外高，不散热。
The atmosphere lets sunlight in but keeps heat from getting out.atmosphere Because we burn fuels such as petrol and coal. We produce carbon dioxide （CO2 ）. CO2 keeps in（贮存） too much heat. The greenhouse effect can cause（导致）sea level to rise and may cause cities to disappear（消失）. Cutting down forests So we can’t make the greenhouse effect worse.
But we are doing something bad to make the greenhouse effect worse. Do you know what it is?
Cutting down forests
Every year, we destroy nature by cutting down huge areas of forests. This makes the greenhouse effect worse because trees take in CO2 and produce oxygen. Cutting down trees also destroys the homes of the animals that live in our forests, and causes the surface of the soil to be easily destroyed by rain. This can result in floods and even more damage to the environment.Read the second part of the text and do the exercises. A. Because trees take in CO2 and produce O2. B. Because trees take in O2 and produce CO2. 1.Why does cutting down trees make the greenhouse effect worse? ( )AA.It destroys the homes of animals that live in forests.
B.It causes the surface of the soil to be easily destroyed by rain.
C.It can result in floods and even more damage to the environment.
D.All of the above.2.What are the results of cutting down forests? ( )DCutting down trees______ the homes of animals that live in forests.
destroys砍树摧毁了住在森林里的动物的家园。 Cutting down trees _______ the surface of the soil to__________________ by rain.
causesbe easily destroyed砍树导致土壤的表面很容易被雨摧毁。Cutting down trees can________ floodsresult in砍树可以导致水灾。So can we cut down trees?But some of us have bad habits which also cause pollution.No, we can’t.Throw away litter.It’s a bad habitBad habits
Many of our habits cause pollution. People often use things once and then throw them away, or leave them on the ground as litter. This creates mountains of rubbish and pollutes our land and seas……Read the third part of the text and do “T” or “F”Do “T” or “F”1.People often use things for one time and then throw them away, or leave them on the ground as litter. ( )
2.Our bad habits will not create mountains of rubbish and pollutes our land and seas. ( )
3.We should recycle as many things as we can. ( )
4. A green consumer is a consumer who wears green clothes. ( )
TFFTA green consumer is a consumer who buy and use products friendly to the environment.What’s the result of throwing litter?It creates mountains of rubbish and pollutes our land and seas.What should we do to protect the environment? We should recycle as many things as we can. We can reuse things for new purposes.It means that we should be green consumers.重新使用Let’s do a survey. Are you a green consumer?How Green Are You?1. Do you recycle
A. newspapers? 1
B. plastic bags? (塑料袋） 1
C. Both 22. When you make a short journey, do you
A. walk or cycle? 3
B. go by car? 0
C. go by public transport? （公共交通） 23. What do you use for shopping?
A. A basket or a cloth bag. （布袋） 3
B. Reused plastic bags. （重复使用的塑料袋） 1
C. New plastic bags. （新的塑料袋） 0Survey How Green Are You?4. Do you often play computer at home?
A. Usually. 0
B. Seldom. 1
C. Never. 25. How often do you switch off the lights and other electrical appliances（电器） when they are not needed?
A. Usually. 2
B. Seldom. 1
C. Never. 06. Do you usually take
A. a bath? 0
B. a shower? 1
总分：_______How Green Are You?Analysis（分析）
Score 1-3 You have not started turning green yet!
4-7 You are pale green.（浅绿色） Try harder!
8-10 You are medium green.（中等绿） Keep going!
11-13 You are bright green. （亮绿色）Well done!How to be a green consumer? Discuss…We should …
We should not…
Speaking 1.throw litter
2….
…
1.recycle as many things as we can.
2….
waste fooduse disposable chopsticksplay computer for a long time use plastic bagsWe shouldn’t…plant more treesWe should… save waterturn off the lights when
we leave the roomgo to school on foot or by bikewriting
To be a green consumer,
1. I should…
2. I should…
3. I shouldn’t…
4. I shouldn’t …
5. …
…
… Promise(承诺书）To be a green consumer,
1. I shouldn’t waste food.
2. I shouldn’t throw rubbish here and there.
3. I shouldn’t use disposable chopsticks.
4. I shouldn’t use plastic bags.
5. I shouldn’t play computer for a long time.
6. I should recycle as many things as I can.
7. I should plant more trees.
8. I should save water.
9. I should turn off the lights when I leave the room.
10.I should go to school on foot or by bike. Promise(承诺书） If everyone can do like these, I am sure the Earth will become more and more beautiful.
Homework 1.Tell your parents how to be a green consumer.
2.Read the article twice.
