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PAGE8/NUMPAGES8最新硕士研究生入学考试英语模拟试卷Directions:Readthefollowingtext.Choosethebestword(s)foreachnumberedblankandmarkA,B,CorDonANSWERSHEET1.(10points)Inthepastfewdecades,remarkablefindingshavebeenmadeinethology,thestudyofanimalsocialbehavior.Earlierscientistshad1thatnonhumansociallifewasalmosttotallyinstinctiveorfixedbygenetics.Muchmorecarefulobservationhasshownthat2variationoccursamongthesocialtiesofmostspecies,showingthatlearningisapartofsociallife.Thatis,the3arenotsolelyfixedbythegenes.4，thelearningthatoccursisoftenatanearlyageinaprocessthatiscalledimprinting.Imprintingisclearly5instinctive,butitisnotquitelikethelearningofhumans;itissomethinginbetweenthetwo.Anillustrationbest6thenatureofimprinting.Once,biologiststhoughtthatducklingsfollowedthemotherduckbecauseofinstincts.Nowweknowthat,shortly7theyhatch,ducklingsfix8anyobjectaboutthesizeofaduckandwillhenceforthfollowit.Soducklingsmayfollowabasketballorabriefcaseiftheseare9forthemotherduckatthetimewhenimprintingoccurs.Thus,socialtiescanbeconsiderably10,evenonesthathaveaconsiderablebase11bygenetics.Evenamongthesocialinsectssomethinglikeimprinting12influencesocialbehavior.Forexample,biologistsoncethoughtbeescommunicatedwithotherspurely13instinct.But,inexamininga“dance”thatbeesdotoindicatethedistanceanddirectionofapollensource,observersfoundthatbeesraisedinisolationcouldnotcommunicateeffectively.Atahigherlevel,thegeneticbaseseemstobemuchmoreforanall?purposelearningratherthanthemorespecificresponsesofimprinting.Chimpanzees,forinstance,generally14verygoodmotherbutJaneGoodallreportsthatsomechimpscarrytheinfantupsidedownor15failtonurturetheyoung.Shebelievesthatthesefemalesweretheyoungestorthe16childofamother.Insuchcircumstances,theydidnothavetheopportunitytoobservehowtheirownmother17forheryoung.Certainlyadolescentchimpswhoarestillwiththeirmotherswhenotheryoungareborntakemuchinterestintherearingoftheiryoungbrotherorsister.Theyhaveanexcellentopportunitytolearn,andthesocialtiesthatarecreatedbetweenmotherandyoung18Goodall
