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 come to know the danger of pollution. And you can find more and more people are working hard to protect our earth.
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小题1:D
小题2:B
小题3:C
小题4:A
小题5:C
小题6:B
小题7:A
小题8:B
小题9:D
小题10:C
题目分析：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
点评：本片文章结构不难，文章大多是以短句构成。对于初中的完型填空，重在理解上下文的意思，一般不会很难。首先花几分钟进行整体的阅读，弄清楚文章议论的主题。不提倡看一个做一个，平时的学习中要注意多积累固定句型，考试时才能判断出相对应的知识点。