先閱讀短文，然后根據(jù)短文內(nèi)容從方框內(nèi)所給的單詞中選擇恰當(dāng)?shù)脑~（注意詞形變化）填入短文空白處，使短文完整、通順。一詞只用一次，一空限填一詞。方框中有兩個詞是多余的。將能填入空白處的答案寫在答題卡上的相應(yīng)題號后。
The world itself is becoming much smaller by using modern traffic and modern communication. Life today is much
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than it was hundreds of years ago, but it has brought new problems. One of the biggest is
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. 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
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because there were not so many people. When the land was
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up or the river was dirty in a place, men moved to another one. But this is no
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true. Man is now slowly pollution the
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world.
Air pollution is still the most serious. It’s bad to all living things in the world, but it is not
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one kind of pollution. Water pollution
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our fish and pollutes our drinking water. Noise pollution makes us become angry more easily.
Many countries are making rules to
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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
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air pollution.
The earth is our home. We must take care of it. That means
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the land, water and air clean.
