标签：话题作文 话题 英语四级作文
字数：900字
提要：Noise Pollution We know the sounds of cities are loud enough to cause great harm to people's hearing in the U.S. One person out of twenty has got some hearing loss. And all over the world the situation is getting worse and worse all the time since the noise increases with the population. With the development of machines, noise has also increased greatly in the 20th century. We live surrounded by l..