题目内容:
WhichofthefollowingisNOTmentionedasacauseoftheproblemdiscussedinthepassage?
A.Naturalbarrierstoseawaterhavebeendestroye B.Thewatertablehasgonedownafterdrought
C.Sealevelhasbeencontinuouslyrisin
D.Evaporationofwaterleavessaltbehin
参考答案:
答案解析: