There is more and more air __(污染)in the big cities .填什么形式

问题描述:

There is more and more air __(污染)in the big cities .填什么形式

填pollution,污染pollution是不可数名词,不能在其后面加“s”
译文:大城市的空气污染越来越严重。

名词,pollution

pulltion/being polltuted/polluted

pollution

pollution 不可数名词