Sewage______(treat)is a big problem in many big cities.

英语阅读理解Rush hour traffic is a problem in many big cities arou pollution is a serious problem in big cities throughout the 高手帮忙翻译一下City traffic is a big problem in some cities in the Water is ____ short in many big cities.A.running B.flowing C Rush hour traffic is a ___ in many big cities around the wor Fast food is very p_____ in many big cities in china. 英语翻译In many big cities in the world,the overuse of cars is t In many big cities of the world,the overuse of cars is thoug Many people什么to work in big cities the air in mountain areas is _ that in big cities.A.as fresh The air in mountain areas is _that in big cities In many cities like Moscow,Paris and some big cities in Chin