Man has been polluting the earth. The more people, the more pollution. Many years ago, the problem was not so serious because there were not so many people. When the land was used up or the river was dirty in a place, men moved to another place. But this is no longer true. Man is now slowly polluting the whole world. ?

Air pollution is still the most serious. It’s bad to all living things in the world, but it is not only one kind of pollution. Water pollution kills our fish and pollutes our drinking water. Noise pollution makes us become angry more easily. ?

Many countries are making rules (法规) to fight pollution. They stop the people from burning coal(煤) in houses and factories in the city, and from blowing dirty smoke into the air. ?  The pollution of SO₂ is now the most dangerous problem of air pollution. It is caused (引起)by heavy traffic. It is certain that if there are fewer people driving, there will be less air pollution. ?

The earth is our home. We must take care of it. That means keeping the land, water and air clean. And we must keep careful of the rise in pollution at the same time.

1. Our world is becoming much smaller 　　　　 . ?

A . because the earth is being polluted day and night?

B. thanks to science developing?

C. because of the rise in pollution?

D. because the earth is blown away by the wind every year

2. Thousands of years ago, life was 　　　　  it is today. ?

A. much easier than　　　　    　　　　 B. as easy as   

C. as hard as　　　　　　　　　　　　   D. much harder than

3. Pollution comes in many ways. We can even hear it. Here “it” means 　　　　 . ?

A. water pollution　　　　　　　　　　  B. air pollution   

C. noise pollution　　   　　　　　　   D. rubbish

4. Air pollution is the most serious kind of pollution because 　　　　 . ?

A. it’s bad to all living things in the world?

B. it makes much noise?

C. it has made our rivers and lakes dirty?

D. it makes us become angry more easily

5. Which of the following is not true?

A. Many countries are making rules to fight pollution. ?

B. The pollution on the earth grows as fast as the world’s population does. ?

C. From now on, maybe people try to go to work by bus or bike instead of car or motorbike. It is helpful to fight against the problem of SO_2.

D. The problem of pollution is not so serious because there are not so many people.

Man has been polluting the earth. The more people，the more pollution. Many years ago，the problem was not so serious because there were not so many people. When the land was used up or the river was dirty in one place，man moved to another place. But this is no longer true. Man is now slowly polluting the whole world.

    Air pollution is still the most serious. It's bad for all living things in the world，but it is not the only one kind of pollution. Water pollution kills our fish and pollutes our drinking water. Noise pollution makes us angry more easily.

Many countries are making rules to fight pollution. They stop people from burning coal(煤)in houses and factories in the city，and from putting dirty smoke into the air. Pollution by so is now the most dangerous kind of air pollution. It is caused by heavy traffic. We are sure that if there are fewer people driving，there will be less air pollution.

The earth is our home. We must take care of it That means keeping the land，water and air clean. And we must take care of the rise in pollution at the same time.

1. 　　   ，our world is becoming much smaller.　　　　　　  

A.　　  Because of the rise  in  pollution 

B. Thanks to science development (发展)

C. Because the earth is being polluted bay and night 

2. Hundreds of years ago，life was 　　   it is today.　　 

    A. much easier than    B. as easy as   C. much harder than

3. Pollution comes in many ways. We can even hear it. Here “it” means　　   . 

    A. trash　　  B. noise pollution    C. much harder than

4. Air pollution is the most serious kind of pollution because　　   .   

    A. it makes much noise

    B. it’s bad for all living things in the world

    C. it makes rivers and lakes dirty

5. Which of the following is rue?　　　　　　　　　　　　　　　　　　  

    A. Man never pollute the earth.

    B. We can't see the pollution.

    C. Many countries are making rules to fight pollution。

The weather is quite hot today.(改为感叹句)

　　_________ _________ _________　it is today!

　　__________ _________　the weather is today!

It is fine today.(改为感叹句)

　　　　 　　　　 it is today!