I used to live in a small town with trees all around. There was no tall building and the only street was narrow. Just outside the town， there was a river. You can see different kinds of fish swimming in the clear water. People here lived a simple life.

　　 Great changes have taken place here. You can see tall buildings， big department stores and factories everywhere. Different kinds of cars and buses are running in the big streets. But with the development of the industry， we have fewer trees. Air and water pollution is becoming more and more serious. We must do something to stop pollution and make our town even more beautiful.

　　 我过去住在一个小镇周围有树木。没有高楼,只有街道很窄。就在城外,有一条河。你可以看到不同种类的鱼在清澈的水里游泳。这里的人们过着简单的生活。

　　 这里发生了巨大的变化。你可以看到高楼大厦,大百货商店和工厂无处不在。不同种类的汽车和公共汽车是运行在大的街道。但随着行业的发展,我们有更少的树。空气和水的污染越来越严重。我们必须做些事情来阻止污染,使我们的城市更加美丽。