题目内容：

1. We must take care of it. We should keep the land, air and water clean. Pollution(污染) is a “dirty” word. 2. Pollution comes in many forms. We can see it, smell it and drink it. Pollution harms our health and even our life.

  People have been polluting the Earth, such as made a fire, washed his clothes in the rivers and threw his rubbish on the ground. Many years ago, the problem was not so serious, because there were not so many people. 3. But now the land was used up or the river was dirty in a place, man moved to another place. So now the whole world is slowly polluted.

When talking about pollution, we once only meant the air pollution. Air pollution is the most dangerous now. 4. We are glad that the public are paying more attention to the dangers of pollution. 5.

 

A. There still was lots of clean air, land and water.

B. And more and more people are working hard to get rid of(消除) it

C. The Earth is our home.

D. but there still is water pollution and noise pollution and so on.

E. Pollution means making things dirty..