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第PAGE\*MERGEFORMAT3页共NUMPAGES\*MERGEFORMAT3页 2021年6月英语四级阅读真题及答案第2套选词填空 Justbecausetheycan'tsingoperaorrideabicycledoesn'tmeanthatanimalsdon'thaveculture.There'snobetterexampleofthisthankillerwhales.Asoneofthemost__26__predators（食肉动物）,killerwhalesmaynotfitthe__27__ofaculturedcreature.However,thesebeastsoftheseadodisplayavastrangeofhighly__28__behaviorsthatappeartobedrivingtheirgeneticdevelopment.Theword"culture"comesfromtheLatin"colere,"which__29__means"tocultivate."Inotherwords,itreferstoanythingthatis__30__orlearnt,ratherthaninstinctiveornatural.Amonghumanpopulations,culturenotonlyaffectsthewaywelive,butalsowritesitselfintoourgenes,affectingwhoweare.Forinstance,havingspentmanygenerationshuntingthefatmarinemammalsoftheArctic,theEskimosofGreenlandhavedevelopedcertaingenetic__31__thathelpthemdigestandutilizethisfat-richdiet,therebyallowingthemto__32__intheircoldclimate.Likehumans,killerwhaleshavecolonizedarangeofdifferent__33__acrosstheglobe,occupyingeveryoceanbasinontheplanetwithanempirethat__34__frompoletopole.Assuch,differentpopulationsofkillerwhaleshavehadtolearndifferenthuntingtechniquesinordertogaintheupperhandovertheirlocalprey（猎物）.This,inturn,hasamajoreffectontheirdiet,leadingscientiststo__35__thattheabilitytolearnpopulation-specifichuntingmethodscouldbedrivingtheanimals,geneticdevelopment.A)acquiredB)adaptationsC)brutalD)deliberatelyE)expressedF)extendsG)habitatsH)humbleI)imageJ)literallyK)refinedL)revolvesM)speculateN)structureO)thrive26.C27.I28.K29.J30.A31.B32.O33.G34.F35.M
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