Cars play an important role in modern society. But they are also responsible for a good part of air pollution in big cities.
　　Write an essay on car and air pollution and base your composition on the outline below:
　　（1）the serious problem of air pollution caused by cars;
　　（2）your suggestions on how to deal with the problem.
　　You should write about 150 words neatly on the ANSWER SHEET.

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