大學(xué)英語(yǔ)六級(jí)聽(tīng)力模擬試題及答案

"Truthascough,mostlyattheirrepressiblegushing.Liesaslines,oftenhavetomemorizearepeat."以下是店鋪為大家搜索整Nowlistentothefollowingrecordingandanswerquestions20to22A.Thefriends'genesaremoredifferentthanthatoftheB.Thefriendsareasbiologicallycloseastheirbrothers.C.Thefriendsmusthavesharedacommonancestor.D.ThefriendshavemoreDNAincommonthanstrangersdo.A.Itoffersusmorepleasure.B.Ithelpsustosurvive.C.Ithelpsustomakefriends.D.Itmakesusbetterunderstood.Itappearsthatwhenitcomestochoosingourfriends,muchofourchoicedependsongenes.Wearemoregeneticallysimilartoourfriendsthanwearetostrangers.ThethemesongtoFriends,a1990sAmericansituationcomedyaboutabunchofbestmates.Twoofthecharacterswererelated,butifthey'vebeenreallifefriends,therestofthemcouldhavebeenasbiologicallycloseascousins.ResearchersfromtheUniversityofCaliforniahaveanalyzedgenevariationinaround2,000people,comparingpairsofunrelatedfriendswithpairsofunrelatedstrangers.Theyfoundthatthefriendshadabout0.1%moreDNAincommononaveragethanstrangersdid.It'sasmallfractionthatmakesabigdifference.It'ssortofliketheirfamilymembers.Andinfactthenumberofgenestheyshareincommonissolarge.Andthatisalmostthattheyshareacommonancestor.It'sliketheirfourthcousins.Thefriendsweremostalikewhenitcametotheirsenseofsmell,butthestudysuggeststhatwecouldbeattractedtopeoplewithsimilartraitsbecauseithelpsustosurvive.Ifyouarethefirstpersonthathasamutationandyoudon'thaveanyfriends,youneedsurroundyourselfwithotherpeoplewhoalsohavethattrait.Thisisnotjustthecasethatpeoplewiththebesttrait,it'sthepeoplewhohavesimilargenes.Whenitcomestoourimmunitiesthough,thefriends,genesweremoredifferentthanthatofthestrangers.Thescientistssaythistrendcouldalsogiveusanevolutionaryedgethoughbecauseifyourfriendscanfightdifferentdiseasesthanyou,youarelesslikelytospreadthosediseases.Itgivesanewmeaningperhapstobeingtheirbio-friends.Question20.Whatdoesourchoiceoffriendsprobablydependonaccordingtothelecture?Question21.WhatdotheresearchersfromtheUniversityofCaliforniafind?Question22.Whyareweattractedtopeoplewithsimilartraitsaccordingtothestudy?tochoosingourfriends,muchofourchoicedependsongenes.California...foundthatthefriendshadabou