- 完形填空
 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:(9)
- A 、from
- B 、in
- C 、on
- D 、with

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參考答案【正確答案:B】
固定搭配。in our solar system"在我們的太陽系內(nèi)”。
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