The earth is our home. We must take care of it. This means keeping the land,air and water clean.

  Pollution is a " dirty" word. To pollute means to make things dirty. Pollution comes in many forms. We see it,smell it and drink it. Pollution is beginning to do harm to our health and even to our life.

  Man has been polluting to the health from the time he first made his fire,washed his clothes in river and threw his rubbish on the ground. Many years ago,the problem was not so serious because there were not so many people. All the dirty things would soon be covered up. There was plenty of clean air,land and water. When the land was used up or the river was dirty in a place,men moved to another place. But this is no longer true. Man is now slowly polluting the white world.

  Talking about pollution,we once mean air pollution. It is true that air pollution is still the most dangerous now,but it is only a kind of pollution.

  We are glad to say that the public has been warned of the dangers of pollution and a large number of people are working hard to get rid of it.

(   ) 6. To take care of the earth means         .

   A. keeping the land clean   B. keeping the air clean

   C. keeping the water clean   D. A.B and C

(   ) 7. Pollution         .

   A. only harms to our health   B. harms our health and life

   C. only harms to our life   D. doesn't any harm

(   ) 8. Why does man move from one place to another?

   A. Because the land is used up.

   B. Because they need to find more food.

   C. Because the water is polluted.

   D. A and C.

(   ) 9. Now if we talk about pollution,we mean         .

   A. only air pollution   B. water pollution

   C. all kinds of pollution   D. land pollution

(   ) 10. Which of the following is NOT right?

   A. Now no one takes any efforts in getting rid of pollution.

   B. Man had being polluting ever since he has being here.

   C. Pollution harms to our health and life.

   D. Once we talked about pollution,we only mean air pollution.

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