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2.Don't throw ______(廢棄的)paper around. It's bad for the environment.

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  What is pollution?

  Pollution means a 1 dirty or harmful things to land, air,water and so on. It is bad for animals and plants, and it even makes people's health in d 2 . In our daily life, we can see different kinds of pollution in many places. There are t 3 main forms of pollution ：land pollution, air pollution and water pollution.

  Land pollution is caused by solid(固體的) waste, such as cans, bottles and some o 4 things. It makes the environment look very bad. However ， air pollution is more s 5 than land pollution. It is much worse in cities and towns because of the fumes (廢氣)from traffic and the waste from human activities. When people d 6 their cars ， they produce fumes with C02 ， N02 and S02. The fumes does great h 7 to people's health. And human activities are also the main r 8 for water pollution. In some places ， it has caused the shortage of fresh water.

  Different kinds of pollution will c 9 many health problems. People have realized (意識到)they must change this serious situation.

  We have only one e 10 . We must try our best to help protect our environment for the future wherever we are


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4.______5.______ 6.______

7. ______8.______ 9.______ 10______

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(   ) 2. A. change B. become

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( ) 2. ―Now people are      trees in the forest.  I think it's too bad for our environment.

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