四川省眉山市高考英语 阅读理解完形填空专题训练12Word文件下载.docx
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四川省眉山市高考英语 阅读理解完形填空专题训练12Word文件下载.docx
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Asbananasripen,thegreenskinturnsyellowgradually.Chemicalchangesoccurinthefleshofthefruitaswell:
starch(淀粉)changestosugar;
pectin(果胶)breaksdown,losingitsstiffness;
andthefleshsoftens.
Isripeningfruitaselfcontainedsystem,oristherateofthesechangesaffectedbytheenvironment?
Wedesignedtheexperimentbelowtoseeifdifferentatmospheres,producedbydifferentpackaging,affectedtherateofripening.Youwillvarytheatmospheresurroundingunripebananasandobservetheeffectontheripeningprocess.
Nowsetupthebananasintheirenvironmentsasfollows:
1.Puttwogreenbananasinapaperbagandfoldthetopovertosealouttheair.
2.Putonegreenbananaandtheveryripebananaintheotherpaperbagandfoldoverthetop.
3.Puttwogreenbananasinaplasticbagandsealit.
4.Wrap(包)onegreenbananatightlyinaplasticbag.
5.Leaveonegreenbananaexposedtotheair.
Leavethefruitaloneforfourorfivedaystoripen.Ripeningfruit“breathes”.ThismeansthatittakesupoxygenandgivesoffCO2.Oxygenisextremelyimportantandnecessaryforthechemicalreactionsinvolvedinripening.Inaddition,ripeningfruitgivesoffanothergas,calledethylene(乙烯).Notonlyisethyleneaproductofripeningfruit,italsopromotesthefurtherripeningofthefruit.
Paperbagstendtokeeptheethylenein,buttheyallowoxygenandethylenetopassthroughslowly.Plasticbagsdonotallowthefreeflowofoxygenorethylene.Inthisexperiment,thegreenbananainpaperbagwiththeripebananashouldripenmostquickly.Thegreenbananasinthepaperbagshouldripenfasterthanthebananasintheplasticbag.Thebananaleftexposedtoairhasanunlimitedsupplyofoxygen,soitwillturnbrownmostquickly.Youwillnoticethatthesideofthisbananathatrestsonthecounterwillripenmorequicklythantheothersides,becauseithastheclosestcontact(接触)withitsownethylene.Thebananathatistightlywrappedinplastichasnooxygensupplyandshouldripenmostslowly.Nowcanyouseewhybananasaresealedinplasticinmanysupermarkets?
【解题导语】 香蕉的成熟需要一定的过程,但是,其成熟过程受环境的影响,那么如何能知道香蕉的成熟过程呢?
科学实验表明香蕉的成熟过程受环境的影响很大,因此,在不同的情况下,可以通过人为的作用来加速或减缓其成熟过程。
1.WhatmakesthegreenbananainBag2ripenmorequicklythantheonesinBag1?
A.Ethylenefromtheveryripebanana.
B.Thefreeflowofoxygenorethylene.
C.CO2fromtheveryripebanana.
D.Thelimitationofoxygensupply.
解析:
选A。
推理判断题。
根据倒数第二段中的最后一句可知本题选A。
2.Howcanweslowdowntheripeningofbananasexposedtotheair?
A.Torestthemonthecounter.
B.Tokeeptheminthebasket.
C.Toputthemontheground.
D.Tohangthemupfromtheceiling.
选D。
细节理解题。
根据Nowsetupthebananasintheirenvironmentsasfollows中的最后一点可知本题选D。
3.Itcanbeconcludedfromthepassagethat________.
A.theripeningbananaisaselfcontainedsystem
B.therateofripeningbananasisaffectedbytheenvironment
C.wrappedbananasexperiencenochemicalchangestoripen
D.ripeningbananasgiveoffoxygen,CO2andethylene
选B。
由第二、三两段的意思可知本题选B。
4.Whyarebananassealedinplasticinmanysupermarkets?
A.Tomakethemripenmorequickly.
B.Tomakethemripenmoreslowly.
C.Tomakebananasfleshsoften.
D.Toturngreenbananasyellow.
根据最后一段的倒数第二句可知本题选B。
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A
In490B.C.theGreekmessenger,Pheidippides,ranabout40kilometersfromthetownof“Marathon”toAthenstoannouncethevictoryofAthensoverMacedon.Sincethen,the42–kilometer“Marathon”racehasbecomeagreattestforathletes.However,formanyyears,onlymenwereallowedtorunthisrace,becausethedistancewassaidtobeunbearableforwomen.In1966,anAmericanwomennamedRobertaGibbprovedthatideawrong.
Gibbhadalwaysenjoyedrunning.Onedayin1964,shesawtheBostonMarathonhappeningasshewasrunninginthewoods.Sincerunningmeantalottoher,shebegantrainingharder,hopingtojointhemarathonsomeday.
Gibbfinallyappliedtoruninthe1966BostonMarathon,butshewasnotgivenentrancebecausetheBostonMarathonAssociationconsideredthatwomenwerenotstrongenoughtorun42kilometers.Yet,thiswasnoobstacletoGibb,forsheknewshehadthephysicalandmentalstrengthtocompletetherace.Onthedaythe1966BostonMarathonwasheld,Gibbhidinthebushesandjumpedintotheracewhenitbegan.Shefinishedtheracein3hoursand21minutes,defeatingtwothirdsofthemenintheraceandprovingthatwomencouldrunthemarathon.
AlthoughwhatGibbdidwasonlytorealizeherdream,indoingsosheshowedtheworldthatwomencouldaccomplishgreaterthingsthanmanypeoplebelievedtheycould.
56.whywerewomenforbiddentorunthe42–kmmarathon?
A.Trainingwasonlyprovidedformen.
B.Womencouldnotworkas
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