论文部分内容阅读
Chongqing,one of the largest heavy industrial cities in China,is not-orious for its serious pollution.Yet Chongqing used to be a beautiful hill-city with fresh air and cleanwater.There were only a few factories along the Changjiang and JialingRivers.There were many green trees on the surrounding mountainsand along the roads and railroad tracks.The rivers and streams wereso clean that you could see fishes swimming back and forth in them;
Chongqing,one of the large heavy industrial cities in China, is not-orious for its serious pollution.Yet Chongqing used to be a beautiful hill-city with fresh air and cleanwater.There are only a few factories along the Changjiang and JialingRivers.There Were many green trees on the surrounding mountainsand along the roads and railroad tracks.The rivers and streams wereso clean that you could see fishes swimming back and forth in them;