精选优质文档-倾情为你奉上1. The earth is in dangerThe earth we are living on is getting worse and worse. Too much pollution makes the earth in danger. We must think about our future. We have understood the problems of the environment.2. Water and air pollution If you live in a big city you must know about the pollution of cars and buses. Do you drive to work every day? Its not good for the environment. I know you have seen the factory, which has many chimneys on it and some foul water channels
