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1、题组层级快练7Unit2TheOlympicGamesⅠ.阅读理解(2017·广州市一模)Dujiangyanistheoldestman－madewatersystemintheworld,andawonderinthedevelopmentofChinesescience.Builtover2，200yearsagoinwhatisnowSichuanProvinceinSouthwestChina,thisamazingengineeringachievementisstillusedtodaytoirrigateover6，00
2、0squarekilometresoffarmland,takeawayfloodwaterandprovidewaterfor50citiesintheprovince.Inancienttimes,theregioninwhichDujiangyannowstandssufferedfromregularfloodscausedbyoverflowfromtheMinjiangRiver.Tohelpthevictimsoftheflooding,LiBing,theregion^governor,togetherwithhisso
3、n,decidedtofindasolution.TheystudiedtheproblemanddiscoveredthattherivermostoftenoverflowedwhenwintersnowatthetopofthenearbyMountYuleibegantomeltastheweatherwarmed.Thesimplestfixwastobuildadam,butthiswouldhaveruinedtheMinjiangRiver.SoinsteadLidesignedaseriesofchannelsbuil
4、tatdifferentlevelsalongMountYuleithatwouldtakeawaythefloodwaterwhileleavingtheriverflowingnaturally.Betterstill,theextrawatercouldbedirectedtothedryChengduPlain,makingitsuitableforfarming.CuttingthechannelsthroughthehardrockofMountYuleiwasaremarkableaccomplishmentasitwas
5、donelongbeforetheinventiongunpowderandexplosives.LiBingfoundanothersolution.Heusedacombinationoffireandwatertoheatandcooltherocksuntiltheycrackedandcouldberemoved.Aftereightyearsofwork,the20－metre－widecanalshadbeencarvedthroughthemountain.Oncethesystemwasfinished,nomoref
6、loodsoccurredandthepeoplewereabletolivepeacefullyandaffluently.Today,Dujiangyanisadmiredbyscientistsfromaroundtheworldbecauseofonefeature.Unlikemoderndamswherethewaterisblockedwithahugewall,DujiangyanstillletswaterflowthroughtheMinjiangRivernaturally,enablingecosystemsan
7、dfishpopulationstoexistinharmony.1.WhatarethebenefitsofDujiangyanaccordingtothefirstparagraph?A.Reducingfloodingandwateringfarmland.B.Protectingthemountainandreducingflooding.C.Wateringfarmlandandimprovingwaterquality.D.Dryingtheriverandsupplyingcitieswithwater.2.Whatwas
8、themaincauseoftheMinjiangRiver'sflooding?A.Heavyrains. B.Meltingsnow.C.Lowriverbanks.D.Steepmountain
