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.
| 小题1: | | A．have | B．take | C．watch | D．keep |
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| 小题2: | | A．produced | B．has produced | C．is producing | D．will produce |
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| 小题5: | | A．other | B．the other | C．another | D．others |
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| 小题6: | | A．pollute | B．polluting | C．clearing | D．clear |
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| 小题7: | | A．neither | B．both | C．either | D．none |
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| 小题8: | | A．the worst | B．the worse | C．the bad | D．worse |
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| 小题10: | | A．Quickly | B．Especially | C．Luckily | D．Anyway |
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