- 阅读理解A
题干：Humanityusesalittlelessthanhalfthewateravailableworldwide.Yetoccurrencesofshortagesanddroughts(干旱）arecausingfamineanddistressinsomeareas,andindustrialandagriculturalby-productsarepollutingwatersupplies.Sincetheworld’populationisexpectedtodoubleinthenext50years，manyexpertsthinkweareontheedgeofawidespreadwatercrisis.Butthatdoesn'thavetobetheoutcome.Watershortagesdonothavetotroubletheworld-ifwestartvaluingwatermorethanwehaveinthepast.Justaswebegantoappreciatepetroleummoreafterthe1970soilcrises,todaywemuststartlookingatwaterfromafresheconomicperspective.Wecannolongeraffordtoconsiderwateravirtuallyfreeresourceofwhichwecanuseasmuchaswelikeinanywaywewant.Instead，forallusesexceptthedomesticdemandofthepoor，governmentsshouldpricewatertoreflectitsactualvalue.Thismeanschargingafeeforthewateritselfaswellasforthesupplycosts.Governmentsshouldalsoprotectthisresourcebyprovidingwaterinmoreeconomicallyandenvironmentallysoundways.Forexample,oftenthecheapestwaytoprovideirrigation(灌慨）waterinthedrytropicsisthroughsmall-scaleprojects,suchasgatheringrainfallindepressions(凹地）andpumpingittonearbycropland.Nomatterwhatstepsgovernmentstaketoprovidewatermoreefficiently，theymustchangetheirinstitutionalandlegalapproachestowateruse.Ratherthanspreadcontrolamonghundredsoreventhousandsoflocal，regional，andnationalagenciesthatwatchvariousaspectsofwateruse，countriesshouldsetupcentralauthoritiestocoordinatewaterpolicy.
题目：The author says that in some hot and dry areas it is advisable to_____. - A 、build big lakes to store water
- B 、construct big pumping stations
- C 、channel water from nearby rivers to cropland
- D 、build small and cheap irrigation systems
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参考答案【正确答案：D】
细节题。答题依据在第四段：… often the cheapest way to provide irrigation water in the drytropics is through small-scale projects(在干旱的热带地区，通常最便宜的取得灌溉用水的方法是建设小规模的工程），即:在炎热干燥的地区应该建造小型而廉价的灌溉系统，故D选项正确。
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