![Theworldisnotonlyhungrybutalsothirstyforwater.Thismayse...]( "Theworldisnotonlyhungrybutalsothirstyforwater.Thismayse...")
- 问题详情：Theworldisnotonlyhungrybutalsothirstyforwater.Thismayseemstrangetoyou,sincenearly70%oftheearth'ssurfaceiscoveredwithwater.Butabout97%ofthatisseawaterorsaltwater.Mancanonlydrinkandusetheother3%offreshwaterfromrivers,lakes,undergroundandsoon.A...
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