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1、2019-2020年高三英语一轮复习题组层级快练7Unit2TheOlympicGames新人教版必修Ⅰ.阅读理解(xx·广州市一模)Dujiangyanistheoldestman－madewatersystemintheworld,andawonderinthedevelopmentofChinesescience.Builtover2，200yearsagoinwhatisnowSichuanProvinceinSouthwestChina,thisamazingengineeringachievementisstilluse
2、dtodaytoirrigateover6，000squarekilometresoffarmland,takeawayfloodwaterandprovidewaterfor50citiesintheprovince.Inancienttimes,theregioninwhichDujiangyannowstandssufferedfromregularfloodscausedbyoverflowfromtheMinjiangRiver.Tohelpthevictimsoftheflooding,LiBing,theregion^
3、governor,togetherwithhisson,decidedtofindasolution.TheystudiedtheproblemanddiscoveredthattherivermostoftenoverflowedwhenwintersnowatthetopofthenearbyMountYuleibegantomeltastheweatherwarmed.Thesimplestfixwastobuildadam,butthiswouldhaveruinedtheMinjiangRiver.SoinsteadLid
4、esignedaseriesofchannelsbuiltatdifferentlevelsalongMountYuleithatwouldtakeawaythefloodwaterwhileleavingtheriverflowingnaturally.Betterstill,theextrawatercouldbedirectedtothedryChengduPlain,makingitsuitableforfarming.CuttingthechannelsthroughthehardrockofMountYuleiwasar
5、emarkableacplishmentasitwasdonelongbeforetheinventiongunpowderandexplosives.LiBingfoundanothersolution.Heusedabinationoffireandwatertoheatandcooltherocksuntiltheycrackedandcouldberemoved.Aftereightyearsofwork,the20－metre－widecanalshadbeencarvedthroughthemountain.Onceth
6、esystemwasfinished,nomorefloodsoccurredandthepeoplewereabletolivepeacefullyandaffluently.Today,Dujiangyanisadmiredbyscientistsfromaroundtheworldbecauseofonefeature.Unlikemoderndamswherethewaterisblockedwithahugewall,DujiangyanstillletswaterflowthroughtheMinjiangRiverna
7、turally,enablingecosystemsandfishpopulationstoexistinharmony.1.WhatarethebenefitsofDujiangyanaccordingtothefirstparagraph?A.Reducingfloodingandwateringfarmland.B.Protectingthemountainandreducingflooding.C.Wateringfarmlandandimprovingwaterquality.D.Dryingtheriverandsupp
8、lyingcitieswithwater.2.WhatwasthemaincauseoftheMinjiangRiver'sflooding?A.Heavyrains. B.Meltingsnow.C.Lowriverbanks
