The earth is our home. We must take care of it. That is to say we must keep the land, air and ___1___ clean.

    But man has begun to pollute(污染)the earth ___2___ he first made a fire, washed his clothes in the river and threw dirty things ___3____. Many years ago, pollution was not so serious because there were not ___4___ many people. There was enough clean air, land and water. When the land or the river was dirty in one place, man ___5___ another place, But now man is slowly polluting the whole world and there is ___6___ enough clean air, nor clean land, nor clean water. More people, more ___7___.

    When is this all to ___8___? Is it possible to get rid of (消除) pollution? We are glad to say that people have come to know the ___9___ of pollution and ___10___ them are working hard to protect (保护) our earth.

(    ) 1. A. river          B. sea           C. lake          D. water

(    ) 2. A. before         B. while         C. since         D. when

(    ) 3. A. on the ground   B. into the air     C. into space      D. near the buildings

(    ) 4. A. such          B. so           C. too          D. as

(    ) 5. A. lived          B. flew to           C. left to        D. moved to

(    ) 6. A. no               B. neither           C. either         D. not any

(    ) 7. A. luck          B. clean places    C. pollution      D. dirty cities

(    ) 8. A. end           B. start          C. over          D. develop

(    ) 9. A. dangerous      B. importance     C. danger           D. use

10.(    ) A. much of       B. a lot      C. the large number of D. a large number of

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