【正确答案】
[参考范文]
The air pollution is harmful and it can be solved.
The air pollution does harm to people. It causes people to suffer from some illnesses such as a head ache and a cough. And it affects the environment, too. For example, in some heavily-polluted areas, plants do not grow well or can't grow at all. But, something can be done to solve the problem. First, we can develop a good public bus transportation system to reduce the number of ears on the roads. Cars are the main source of air pollution in many places. And second, we can move all the pollution-causing factories out of cities.
To sum up, something can be done to solve the serious problem of air pollution.