The world itself is becoming much smaller by using modern traffic and modern communication means （通讯设备）.Life today is much easier than it was hundreds of years ago, but it has brought new problems. One of the biggest is pollution. To pollute means to make things dirty. Pollution comes in many ways. We see it, smell it, drink it and even hear it.
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 in houses and factories in the city, and from putting dirty smoke into the air.
Pollution by carbon dioxide is now the most dangerous kind of air pollution. It is caused by heavy traffic. It is true 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 population at the same time.
小题1:.
. Hundreds of years ago, the pollution was _________it is today.

A．much easier than

B．as easy as

C．as hard as

D．much less than

小题2:.
Our world is becoming much smaller_________.

A．because the earth is being polluted day and night

B．because science is developing

C．because of the rise in population

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

小题3:.
Air pollution is the most serious kind of pollution because_________.

A．it does harm to all living things in the world	B．it makes much noise
C．it makes our rivers and lakes dirty	D．it makes us angry more easily

小题4:.
Which of the following is NOT the possible way to reduce air pollution?

A．Stop people from burning coal in the houses and factories in the city

B．Stop putting dirty smoke into the air

C．Encourage people to go to work by bike or on foot instead of driving a car

D．Don’t throw rubbish into the river.

小题5:.
Which of the following is NOT true?

A．The problem of pollution is not so serious because there are not so many people living on the earth.

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

C．If people could go to work by bike ,it would be helpful against the problem of carbon dioxide.

D．Many countries are making rules to fight against pollution.