问答题Directions：　　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

Directions：　　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 160-200 words neatly on the ANSWER SHEET.