The earth is our home and we must take good care of it. That is to say we must 1 the land, air and water clean. But man 2 a lot of pollution on earth since he first made fire, washed his clothes in the river and threw rubbish on the ground. Many years ago, pollution was not so serious 3 there were not so many people.
There were enough 4 air, land and water. When the land or the river was dirty in one place, man moved to 5 place. Man is 6 the whole world now. So there is 7 enough clean air, nor clean land, nor clean water now. The more people there are in one place, 8 environment they maybe have.
Perhaps you are afraid 9 is endless(无休止的) for people to produce pollution.
10 , we are glad to tell you that people have e to know the danger of pollution. And you can find more and more people are working hard to protect our earth.
【小题1】A．haveB．takeC．watchD．keep【小题2】A．producedB．has producedC．is producingD．will produce【小题3】A．soB．ifC．becauseD．but【小题4】A．cleanB．oldC．dirtyD．new【小题5】A．otherB．the otherC．anotherD．others【小题6】A．polluteB．pollutingC．clearingD．clear【小题7】A．neitherB．bothC．eitherD．none【小题8】A．the worstB．the worseC．the badD．worse【小题9】A．thatB．thisC．what D．it【小题10】A．QuicklyB．EspeciallyC．LuckilyD．AnywayD
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(答案→)D
解析：这篇文章讲述了地球是我们的家，但是它现在已经受到了严重的污染，幸运的是，现在人们已经开始认识到污染的危害性，越来越多的人正在努力保护地球。
【小题1】A. have有 B. take带走 C. watch观看 D. keep保持 由上句take good care of it可知我们应该保持地球清洁。故选D
【小题2】根据句意：自从第一次有了火之后，人类已经对地球产生了很多的污染。由后面的since he first made...可知用现在完成时。故选B
【小题3】A. so所以 B. if如果 C. because因为 D. but但是 根据句意：很多年前，污染没有这样严重，是因为以前没有那么多的人。下句和上句是因果关系，故用because。故选C
【小题4】 由上文中there were not so many people可知过去有足够清洁的空气、大地和水。故选A
【小题5】根据句意：当一个地方的土地和河水被污染之后，人们就会搬到另一个地方。one... another 意为“一个……另一个”。故选C
【小题6】根据句意:人们现在正在污染整个地球。be + doing 表示现在进行时 故选B
【小题7】根据句意:现在既没有足够清新的空气，也没有清洁的土地和水。neither ...nor... 意为“既不……也不……”。故选A
【小题8】根据句意：一个地方的人越多，那个地方的环境就越糟糕。“the+比较级+其他，the+比较级+其他”表示“越……,越……”。故选B
【小题9】根据句意：或许你害怕人们会无休无止的产生污染。it 在宾语从句中作形式主语。故选D
【小题10】A. Quickly很快地 B. Especially特别地 C. Luckily幸运地 D. Anyway无论如何 根据句意：幸运的是，人们现在已经开始知道了污染的危害性。故选C