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    題干:AreweatthebeginningofanotherAgeofExploration?Perhapsevenmoreimportantly,areweatthebeginningof(1)AgeofColonization?Asthepopulationoftheworldincreasestowardsthepoint(2)theearthcannolongersupportallthepeople(3)onit,thesecondquestionbecomesurgent.Willwediscoveranewworld,(4)Columbusdid,onwhichhumanlifewillbepossible?Atthispointinthespaceage,noonecanreallyanswerthesequestions.Wecansay,(5),thatwewillnotseetomorrowthekindofspacetravelthat(6)fictionandthemovieshaveshown.Itwillbealongtimebeforewehaveflightsthatrun(7)tohumancoloniesonthemoonorononeoftheplanets.Wearenotevengoingtobeableto(8)immediateadvantagesofthemineralsthatwemayfindontheplanets(9)ourownsolarsystem.Greatproblemsmustbesolved(10)wecouldsendcolonistsoutintospace.Thedistancesthatmustbe(11)andthelengthoftimeittakestodothatcanhardlybe(12).Therearealsodangersthatwestilldonotreallyunderstandfromradiation,forexample,orfrompiecesofmatters(13)inspace,orfromcontaminationfromformsoflifethatmight(14)there.Thereisalsoneedforhumanstotaketheirownenvironmentintospace(15)them.Sofarno"island"hasbeendiscoveredinspaceonwhichpeoplecanexistwithoutsystemsthat(16)life,andthesesystemsmustaccompanyanyfuturespace(17).Finally,onthemostpractical(18),therehastobeenormousexpense(19)inspaceexploration.TheU.S.andRussiangovernmenthavealreadyspentbillionsofdollarsforprojects(20)whichtheycanreceiveareturnonlyinknowledgeandnotinmoney.
    題目:(4)
  • A 、if
  • B 、what
  • C 、as
  • D 、such

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參考答案

【正確答案:C】

邏輯銜接。這里的意思是“我們能否像哥倫布那樣,發(fā)現(xiàn)一個(gè)人類可以生存的新世界”,這里需要填入一個(gè)連詞,表達(dá)“像”的意思,故只能選C。

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