问题标题：
Theworldisnoronlyhungry，butitisalsot1forwater．Thismayseemstrangetoyou，sincenearly70％oftheearthisc2withwater：Butabout97％ofthishugeamountisseawater，orsaltwater．Mancanonlydrinkanduse
问题描述：
Theworldisnoronlyhungry，butitisalsot1 forwater．Thismayseemstrangetoyou，sincenearly70％oftheearthisc2withwater：Butabout97％ofthishugeamountisseawater，orsaltwater．Mancanonlydrinkandusetheother3％——thefreshwaterfromrivers，lakes，
underground，andothersources.Evenw3，someofithasbeenp4．Nowourneedforwaterisi5 -almostdaybyday．Wemusttakestepstosolvethisprob1em，orwecan’ta6aworldwidewatershortagelateron．
Weallhavetolearnhowto s7 water．Oneofthefirststepsistodevelopwaysofreusingit．
Todayinmostlargecities，waterisusedonlyo8 andthensentoutintoasewersystem(下水道)．Butitispossibletogetusedwatertoapurifying(净化)factory．Thereitcanbepurifiedsot9 itcanbeusedagain．
Theworld’swatershortageisabigp10forhumans．Wemustsaveeverydropofwaterandkeepourriversandlakesclean．
陈珮珮回答：
1．thirsty 2．covered 3．worse 4．polluted 5．Increasing6．avoid 7．stop 8．once &nb...
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