阅读下列短文,从每题所给的四个选项(A、B、C和D)中,选出最佳选项。
Anewstudywarnsthataboutthirtypercentoftheworld'speoplemaynothaveenoughwaterbytheyear2025.
AprivateAmericanorganizationcalledPopulationActionInternationaldidthenewstudy.Itsaysmorethanthreehundredandthirtyfivemillionpeoplelackenoughwaternow.Thepeopleliveintwentyeightcountries.MostofthecountriesareinAfricaortheMiddleEast.
PAIresearcherRobertEngelmansaysbytheyear2025,aboutthreethousandmillionpeoplelackwater.Atleast18morecountriesareexpectedtohaveseriouswaterproblems.Thedemandforwaterkeepsincreasing.YettheamountofwateronEarthstaysthesame.
MrEngelmansaysthepopulationincountriesthatlackwaterisgrowingfasterthaninotherpartsoftheworld.Hesayspopulationgrowthinthesecountrieswillcontinuetoincrease.
Thereportsayslackofwaterinthefuturemayresultinseveralproblems.Itmayincreasehealthproblems.Lackofwateroftenmeansdrinkingwaterisnotsafe.MrEngelmansaysthereareproblemsallovertheworldbecauseofdiseasessuchascholerathatarecarriedinwater.
Lackofwateralsomayresultinmoreinternationalconflict(冲突).Countriesmayhavetofightforwaterinthefuture.Somecountriesnowgetsixtypercentoftheirfreshwaterfromothercountries.ThisistrueofEgypt,theNetherlands,Cambodia,Syria,SudanandIraq.Andthereportsayslackofwaterwouldaffecttheabilitytoimprovetheireconomies.Thisisbecausenewindustriesoftenneedalargeamountofwaterwhentheyarebeginning.
ThePopulationActionInternationalstudygivesseveralsolutions(解决方法)tothewaterproblem.Oneway,itsays,istofindwaystousewaterformorethanonepurpose.Anotherwayistoteachpeopletobecarefulnottowastewater.Athirdwayistouselesswaterforagriculture.
Thereportalsosayslongtermsolutionstothewaterproblemmustincludecontrolsonpopulationgrowth.
1.Accordingtothereport,howmanycountrieswilllackwaterbytheyear2025?
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