空气污染
Directions：
A. 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 of about 200 words on car and air pollution.
B. Your essay must be written neatly on ANSWER SHEET 2.
C. Your essay should cover the following points：
1. the serious problem of air pollution caused by cars;
2. your suggestions on how to deal with the problem.
