精选优质文档-倾情为你奉上A: Well, no one could survive without water, but you see pollution has been making more and more water unable for drinking.A：如果没有水谁也活不了，但是你看，污染正使越来越多的水没办法供人饮用。B: Yeah. Water pollution has for a long time been a major concern among the environmental issues.B：是啊，长期以来水污染一直都是环境问题中备受关注的。A: But what are the sources of water pollution?A：但是都有哪些污染源呢？B: They could generally be divided into two categories: direct and indirect contaminant sources.B：可以分为两大类，即直接污染和间接污染。A: Well,
