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高考英语完形填空专题训练阅读下列短文，从短文后各题所给的A、B、C和D四个选项中，选出可以填入空白处的最佳选项。一Formillionsofpeople,themerethoughtofclimbingaladderorlookingoveracliffisenoughtosettheheartracing.Butnowscientistshavecometothe1withapilltotreatthefearof2.Themedicine—whichcontainsthestresshormonecortisol(压力荷尔蒙皮质醇)—3withtraditionaltreatmenttohelppeople4whatmakesthemfrightened.Fearofhighplaces,oracrophobia,isoneofthemostcommonphobias(恐惧症).5,itistreatedbyexposingpeopletoheights.6,theoldwayisrarelyfullysuccessful.The7methodcombinesthis“exposuretreatment”withanamountofcortisol,thehormonereleasedbythebodyintimesof8.Theinternationalteamofscientiststestedthe9ofacortisolpillon40people10acrophobia.Theparticipantswereeithergivencortisoloraplacebo11theywereexposedtoheights.Placeboslooklike12,buttheyhavenomedicaleffectandaresafeforhumans.Attheendofthe13,theparticipantswereaskedtodescribehow14theywereusingaquestionnaire.Thosetakingcortisolwere15lessfrightened.Theeffectswerealso16,withtheparticipantsstillfeelinglessfrightenedamonthaftertakingthepill.Thescientists17thatcortisolworksbymakingpeopleforgetwhatthey18.Itisthoughttocutbloodflowtoareasofthebrainthatbringbackmemories,leavingpeopleunabletorecall(忆起)theirphobiaofheights.Italso19thecreationofnewmemories—allowingpatientsto20theirnew-foundbravery.Thedrug’seffectshavebeenreportedintheProceedingsoftheNationalAcademyofSciences.1.A.rescueB.sceneC.groundD.agreement2.A.heightsB.competitionC.stagesD.weight3.A.battlesB.worksC.comparesD.plays4.A.admitB.denyC.forgetD.recognize5.A.SuccessfullyB.SurprisinglyC.OccasionallyD.Traditionally6.A.InsteadB.BesidesC.ThereforeD.However7.A.excellentB.fastC.newD.usual8.A.stressB.troubleC.peaceD.failure9.A.effectsB.qualitiesC.importanceD.safety10.A.studyingB.havingC.discussingD.knowing11.A.thoughB.ifC.beforeD.after12.A.snacksB.fruitsC.medicineD.food13.A.experimentB.gameC.presentationD.report14.A.proudB.scaredC.depressedD.confused15.A.strangelyB.noticeablyC.hopefullyD.temporarily16.A.immediateB.indirectC.lastingD.possible17.A.answerB.questionC.refuseD.believe18.A.doubtB.promiseC.valueD.fear19.A.preventsB.encouragesC.involvesD.proves20.A.predictB.imagineC.describeD.remember二Humans,throughtheages,haveexperiencedmanychangesfromthetimewhentheylivedindarkcavestonowadayswhentheyliveincomfortableapartments,1onethingremainsthesame:peoplealways2ingroups.Sowhyaregroupsso3topeople?Ithinkitisbecauseofthepsychological,socialandfinancialadvantages.Withregardtopsychologicalaspects,Ithinkgroupsmakepeoplefeelmorepurposefuland4.Whenoneislonelyandbored,heorshemay5littlepurposeinlife.Butoncetheyjoinagroupthatpromotesa6cause,theirlifewillsoonbecomemorepurposeful.7,agroupcangiveanindividualcouragetoovercomedifficulties.Everyoneknowsthesaying,“Thereis8innumbers.”Nodoubt,meetingchallengesasagroupisofteneasierthanmeetingthem9.10speaking,groupsandorganizationsprovideaninterestingwayforpeoplewithcommonintereststoshareinformation,ideasandhobbies.Today,thereare11socialgroups,includingrunninggroups,culturegroupsanddancegroups.Asagroup,peoplecanhavemorefunandcan12fromthecollectionofdifferentideas13bythegroup’smanymembers.Ithinkthesaying,“Twoheadsarebetterthanone.”14here.Finally,Ithinkgroupsareimportanttopeoplebecauseitallowsthemtopooltheirresources(资源)togethertomakecertainthingsmore15.Forexample,manypeopleliketravelinginlargegroupsbecausehotelsandairlinesarealwayswillingtoofferalowerprice16groupbusiness.Manymodernsuburbanneighborhoodshaveformedcarpoolstoshareandlowerthe17ofgettingtoandfromthecity.There’s18tothesaying,“It’s19bythedozen.”Inconclusion,Ithinkgroupsandorganizationsgivepeoplepsychological,socialandfinancialadvantages.Nomatterhowtheworld20,theyplayanessentialroleinourlife.1.A.soB.butC.thoughD.unless2.A.playB.liveC.eatD.compete3.A.complexB.simpleC.importantD.normal4.A.carefulB.successfulC.powerfulD.grateful5.A.collectB.promoteC.wasteD.find6.A.difficultB.smoothC.lostD.worthy7.A.BesidesB.InsteadC.OtherwiseD.Therefore8.A.mysteryB.strengthC.safetyD.patience9.A.againB.aloneC.apartD.abroad10.A.SociallyB.HonestlyC.PersonallyD.Roughly11.A.countlessB.limitedC.funnyD.actual12.A.hideB.benefitC.wakeD.separate13.A.acceptedB.appreciatedC.producedD.considered14.A.passesB.endsC.appliesD.lies15.A.publicB.specialC.officialD.affordable16.A.inspiteofB.inmemoryofC.inadditiontoD.inexchangefor17.A.costB.speedC.chanceD.profit18.A.truthB.realityC.principleD.purpose19.A.luckierB.quickerC.cheaperD.firmer20.A.worksB.triesC.suffersD.changes三IwasonholidayinCornwall(acountyinSouthwestEngland)inAugust.Suddenly,whilewalkinginacarparkwithafriend,Ifeltreally1.Iwashavingaseriousheartattack,andimmediatelyI2.Ialmostdied,thereandthen,age47.Asmyfriendwastryingto3whatwashappening,astranger4outofthecarpark5,havingseenmeontheground,andaskedmyfriendifIwasOK.ThestrangerandhispassengergotoutofthecarandcameovertowhereIwas6.Theyatonce7whathadhappenedand8.Thedriverandhispassengerwereboth9experts.TheywereconsultantsfromPlymouth’sA&E(AccidentandEmergency)DepartmentatDerrifordHospital.Iwasalsoin10.Thedriverhappenedtohavetheonlypieceof11thatcouldbringmebacktolif