先阅读短文，然后根据短文内容从方框内所给的单词中选择恰当的词（注意词形变化）填入短文空白处，使短文完整、通顺。一词只用一次，一空限填一词。方框中有两个词是多余的。将能填入空白处的答案写在答题卡上的相应题号后。

The world itself is becoming much smaller by using modern traffic and modern communication. Life today is much    【小题1】   than it was hundreds of years ago, but it has brought new problems. One of the biggest is    【小题2】    . To pollute means to make things dirty. Pollution comes in many ways. We see it, drink it and even hear it.
Man has been polluting the earth. The more people are, the more pollution is. Many years ago, the problem was not so 【小题3】    because there were not so many people. When the land was    【小题4】  up or the river was dirty in a place, men moved to another one. But this is no    【小题5】     true. Man is now slowly pollution the   【小题6】   world.
Air pollution is still the most serious. It’s bad to all living things in the world, but it is not    【小题7】  one kind of pollution. Water pollution   【小题8】    our fish and pollutes our drinking water. Noise pollution makes us become angry more easily.
Many countries are making rules to    【小题9】    pollution. They stop the people from burning coal 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 by heavy traffic. It is certain that if there are fewer people driving, there will be   【小题10】   air pollution.
The earth is our home. We must take care of it. That means   【小题11】    the land, water and air clean.

根据短文内容，选择正确的选项。
The world itself is becoming much smaller by using modern traffic and modern communication means(交流方式). 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 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 fish and pollutes drinking water. Noise pollution makes us become angry more easily.
Many countries are making rules to fight against pollution. They stop the people from burning coal 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 mostly caused 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 try to control the growth of population at the same time.
【小题1】Our world is becoming much smaller .

 He _________his hometown for twenty years. He really misses it!

A. has been away from                B. left

C. has left                          D. is away from