请阅读Passage2，完成第小题。 Passage2 Thatexperiencesinfluencesubsequentbehaviorisevidenceofanobviousbutneverthelessremarkableactivitycalledremembering.Learningcouldnotoccurwithoutthefunctionpopularlynamedmemory.Constantpracticehassuchaneffectonmemoryastoleadtoskillfulperformanceonthepiano,torecitationofapoem,andeventoreadingandunderstandingthesewords.So-calledintelligentbehaviordemandsmemory,rememberingbeingaprimaryrequirementforreasoning.Theabilitytosolveanyproblemoreventorecognizethataproblemexistsdependsonmemory. Typically,thedecisiontocrossastreetisbasedonrememberingmanyearlierexperiences. Practice(orreview)tendstobuildandmaintainmemoryforataskorforanylearnedmaterial. Overaperiodofnopracticewhathasbeenlearnedtendstobeforgotten;andtheadaptiveconsequencesmaynotseemobvious.Yet,dramaticinstancesofsuddenforgettingcanbeseentobeadaptive.Inthissense,theabilitytoforgetcanbeinterpretedtohavesurvivedthroughaprocessofnaturalselectioninanimals.Indeed,whenone'smemoryofanemotionallypainfulexperienceleadstoseriousanxiety,forgettingmayproducerelief.Nevertheless,anevolutionaryinterpretationmightmakeitdifficulttounderstandhowthecommonlygradualprocessofforgettingsurvivednaturalselection. Inthinkingabouttheevolutionofmemorytogetherwithallitspossibleaspects,itishelpfultoconsiderwhatwouldhappenifmemoriesfailedtofade.Forgettingclearlyaidsorientationintime,sinceoldmemoriesweakenandthenewtendtostandout,providingcluesforinferringduration. Withoutforgetting,adaptiveabilitywouldsuffer,forexample,learnedbehaviorthatmighthavebeencorrectadecadeagomaynolongerbe.Casesarerecordedofpeoplewho(byordinarystandards)forgotsolittlethattheireverydayactivitieswerefullofconfusion.Thisforgettingseemstoservethesurvivaloftheindividualandthespecies. Anotherlineofthoughtassumesamemorystoragesystemoflimitedcapacitythatprovidesadaptiveflexibilityspecificallythroughforgetting.Inthisview,continualadjustmentsaremadebetweenlearningormemorystorage(input)andforgetting(output).Indeed,thereisevidencethattherateatwhichindividualsforgetisdirectlyrelatedtohowmuchtheyhavelearned.Suchdataoffersgrosssupportofcontemporarymodelsofmemorythatassumeaninput-outputbalance. Accordingtothepassage,ifapersonneverforgot,__________. 查看材料
A.he would survive best
B.he would have a lot of trouble
C.the evolution of memory would stop
D.his ability to learn would be enhanced
正确答案是B