Scientists have helped people understand the dangers the earth is facing.As people live on the earth, we should be fully ready to deal with the dangers.If we do not pay more attention to the problems caused by air pollution, our earth may no longer be a healthy place for plants, animals, and people to live.

　　　 Cleaning up the air is a job that all countries must work on.The problems caused by air pollution can be solved, but a lot of work needs to be done.Governments around the world are beginning to work together to lower the levels of dangerous gases in the atmosphere (大气层).If this can be done well, the ozone layer (臭氧层) can rebuild itself, global warming can be controlled, and acid rain can be reduced.

　　　 In 1967, the government of the United States passed the Clean Air Act.More parts were added to the act in 1970, 1977 and 1990.As a result of these laws, cars now must reduce the amounts of harmful gases.Power factories must use “clean coal” methods to reduce acid?rain gases they produce.

　　　 In 1970, the Environmental Protection Agency (EPA) was set up.The EPA's job is to make sure that the environmental laws are being followed and to find out new dangers and offer solutions.The first Earth Day was also ce?lebrated in 1970.

　　　 While it is very important to address with air on a global scale, each person can also do something to protect the earth.Here are some things you can do every day：

(1)Turn down the heat and air conditioning.

(2)Use the dishwasher only when there are full of dishes.

(3)Practice the 3 Rs: recycle, reuse, and reduce.

(4)Plant a tree.

(5)Walk or ride your bike.

(　　)6.If we don't care about ________ problems, our earth may no longer be a healthy place.

A.air pollution B.water pollution

C.noise pollution　 D.sea pollution

(　　)7.Every country should ________ to solve the problems caused by air pollution.

A.rebuild the ozone layer　　　 B.clean up the air

C.produce harmful gases D.reduce acid?rain gases

(　　)8.All the things the EPA can do is to ________.

A.make more laws 　　　　　 　B.find out new dangers

C.protect the environment D.plant trees

(　　)9.The Clean Air Act was passed ________ by the American government.

A.In 1967　 B.In 1970 　C.In 1977 D.In 1978

(　　)10.In our daily life, we can do something to protect the earth by ________.

A.using more cars B.riding the bikes

C.cutting down trees　 D.turning up the heat

1. When I got there, they 　　　　  (play) computer games.

2. When I 　　　　  (finish) my homework, I’ll go and fly kites with you.

3. The teacher used 　　　　  (drive) to work when he was in Shanghai.

4. While Mary 　　　　  (mend) her bike, her uncle came in.

5. It is four years since we 　　　　  (move) into this new house.

6. I heard him 　　　　 (sing) when I passed his office.

7. She doesn’t know which 　　　　 (choose).

8. We 　　　　 (not write) to each other for about three years.

9. My parents have gone to the supermarket. They 　　　　  (be) back in two hours, I am afraid.

10. We all find it very difficult 　　　　 (learn) English well in a short time.

 

Hundreds of years ago, life was harder than it is today. People didn’t have modern machines. There was no medicine, either.
Life today brings new problems. One of the biggest is pollution. Water pollution has made our rivers and lakes dirty. It kills our fish and pollutes our drinking water. Noise pollution makes us talk louder and we become angry more easily. Air pollution is the most serious kind of pollution to all living things in the world.
Cars, planes and factories all pollute our air every day. Sometimes the polluted air is very thick. People cannot see the sky clearly.
Many countries are making rules to fight against pollution. Factories now must clean their water before they throw it away. And they mustn’t let dirty smoke go into the air.
There are many things we can do to fight against pollution. We should put waste things in dustbins and do not throw them on the ground. We should go to work by bike or on foot instead of taking a car or a bus. If there are fewer people driving, there will be less pollution.
Rules are not enough. We should do our best to fight against pollution.
【小题1】Which of the following is NOT true about life in the past?

A．There were no modern machines. B．There was no modern medicine. C．There was much air pollution. D．There were not many people.

【小题2】What should people do to fight against pollution?

A．Always drive a car to work. B．Throw waste things anywhere they like. C．Put waste things in dustbins. D．Always take a bus to go to school.

【小题3】The most serious pollution is              .

A．water pollution B．air pollution C．noise pollution D．light pollution

【小题4】What should factories do to fight against pollution?

A．Let dirty smoke go into the air. B．Throw dirty water away without cleaning it. C．Close the factories. D．Let dirty water go after cleaning it.

【小题5】From the passage, we know that              .

A．a few years ago, there was no pollution at all. B．people today don’t have to talk to each other loudly C．we can drink water from the polluted rivers and lakes. D．Everybody should try his or her best to fight against pollution

 

Hundreds of years ago, life was harder than it is today. People didn’t have modern machines. There was no medicine, either.
Life today brings new problems. One of the biggest is pollution. Water pollution has made our rivers and lakes dirty. It kills our fish and pollutes our drinking water. Noise pollution makes us talk louder and we become angry more easily. Air pollution is the most serious kind of pollution to all living things in the world.
Cars, planes and factories all pollute our air every day. Sometimes the polluted air is very thick. People cannot see the sky clearly.
Many countries are making rules to fight against pollution. Factories now must clean their water before they throw it away. And they mustn’t let dirty smoke go into the air.
There are many things we can do to fight against pollution. We should put waste things in dustbins and do not throw them on the ground. We should go to work by bike or on foot instead of taking a car or a bus. If there are fewer people driving, there will be less pollution.
Rules are not enough. We should do our best to fight against pollution.
【小题1】Which of the following is NOT true about life in the past?

【小题2】What should people do to fight against pollution?
【小题3】The most serious pollution is              .
【小题4】What should factories do to fight against pollution?
【小题5】From the passage, we know that              .
 

Hundreds of years ago, life was harder than it is today. People didn’t have modern machines. There was no medicine, either.

Life today brings new problems. One of the biggest is pollution. Water pollution has made our rivers and lakes dirty. It kills our fish and pollutes our drinking water. Noise pollution makes us talk louder and we become angry more easily. Air pollution is the most serious kind of pollution to all living things in the world.

Cars, planes and factories all pollute our air every day. Sometimes the polluted air is very thick. People cannot see the sky clearly.

Many countries are making rules to fight against pollution. Factories now must clean their water before they throw it away. And they mustn’t let dirty smoke go into the air.

There are many things we can do to fight against pollution. We should put waste things in dustbins and do not throw them on the ground. We should go to work by bike or on foot instead of taking a car or a bus. If there are fewer people driving, there will be less pollution.

    Rules are not enough. We should do our best to fight against pollution.

1.Which of the following is NOT true about life in the past?

A. There were no modern machines.	B. There was no modern medicine.
C. There was much air pollution.	D. There were not many people.

2.What should people do to fight against pollution?

A. Always drive a car to work.	B. Throw waste things anywhere they like.
C. Put waste things in dustbins.	D. Always take a bus to go to school.

3.The most serious pollution is              .

A. water pollution	B. air pollution
C. noise pollution	D. light pollution

4.What should factories do to fight against pollution?

A. Let dirty smoke go into the air.

B. Throw dirty water away without cleaning it.

C. Close the factories.

D. Let dirty water go after cleaning it.

5.From the passage, we know that              .

A. a few years ago, there was no pollution at all.

B. people today don’t have to talk to each other loudly

C. we can drink water from the polluted rivers and lakes.

D. Everybody should try his or her best to fight against pollution