题目内容：
Thereareblanksinthefollowingpassage.ForeachblanktherearefourchoicesmarkedA）,B）,C）andD）ontherightsideofthepaper.YoushouldchoosetheONEthatbestfitsintothepassage.ThenmarkthecorrespondingletteronAnswerSheet2withasinglelinethroughthecentre. Languageisthemostastonishingbehaviorintheanimalkingdom.Itisthespecies-typicalbehaviorthatsetshumanscompletely__67__fromallotheranimals.Languageisameansofcommunication,__68__itismuchmorethanthat.Manyanimalscan__69__.Thedanceofthehoneybeecommunicatesthelocationofflowers__70__othermembersofthehive（蜂群）.Buthumanlanguagepermitscommunicationaboutanything,__71__thingslikeunicorn（独角兽）thathaveneverexisted.Thekey__72__inthefactthattheunitsofmeaning,words,canbe__73__togetherindifferentways,accordingto__74__,tocommunicatedifferentmeanings.
Languageisthemostimportantlearningwedo.Nothing__75__humanssomuchasourabilitytocommunicateabstractthoughts,__76__abouttheuniverse,themind,love,dreams,ororderingadrink.Itisanimmenselycomplex__77__thatwetakeforgranted.Indeed,wearenotawareofmost__78__ofourspeechandunderstanding.Considerwhathappenswhenonepersonisspeakingto__79__.Thespeakerhastotranslatethoughtsinto__80__language.Brainimagingstudiessuggestthatthetimefromthoughtstothe__81__ofspeechisextremelyfast,only0.04seconds!Thelistenermusthearthesoundsto__82__outwhatthespeakermeans.Hemustusethesoundsofspeechto__83__thewordsspoken,understand the pattern of __84__ of the words (sentences), and finally __85__ the meaning. This takes somewhat longer, a minimum of about 0.5 seconds. But __86__ started, it is of course a continuous process.
A．apart
B．off
C．up
D．down
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