以“Air pollution”英语作文

问题描述:

以“Air pollution”英语作文
老师要求写一篇以“Air pollution”为题的英语作文,字数在150左右,不要用太难的句型,水平别太高,简单点就好.但也别太简单了.

Air pollution is at its worst over big cities where millions of people live, work, and travel about in cars, buses, and trucks. Factory chimmeys can be fitted with devices to cut down[4] air pollution...