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.

　　It's easier to go down hill than to climb up hill, so it's easier to fall into bad habits than into good __1__ Bad habits do not come ___2__. They come little by little, so you don't know their __3___. Schoolboys first pick up little bad habits at __4___ and on the streets. When they cannot do their homework, they copy from their ___5__. If they see bigger boys smoking, the __6___ want to learn to smoke. If they see their friends gambling（赌博）,they want to gamble. When they get it ___7__, the habits become stronger and stronger. Then they can no longer give them up. From copying, they learn to ___8__ for gambling, and they learn to cheat（欺骗）no one believes in them. How __10___ it is that we stop the bad habits at the beginning !