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1、http://www.tdxl.cn/同等学力英语专项练习之完形填空完形填空（一）TheworldlostsevenastronautsofSpaceShuttleColumbia（哥伦比亚号航天飞机）thismonth.Itbroughthometheseriousriskthat1faceintothehostileenvironsbeyondour2planets,raisingthequestionof3exploringtheheavensshouldbelefttounmannedmissions.4lessexciting,suchmissionswill5nori
2、skstohumans.Andalreadyrobotshaveanimpressivelistofaccomplishments6totheirfleshandbloodcounterparts（职级地位相当的人或物）。“7areallaboutspecificallytargetedscientific8oftheuniversearoundus.Withoutexceptions,theseeffortsriseoutofintensecompetition9themostcompelling,andanswerablequestionsare10,”saidMarcBui
3、e,anastronomer（天文学家）atLowellObservatoryinFlagstaff,Arizona.11haveduginthedirtonMars,flowninthe12ofJupiter（木星），anddrivenbythemoonsofNeptune.Afeware13approachingtheboundaryofthe14.Humans,15,havemostlybeengoingincircles,16abovethesurfaceoftheplanet.17thebriefApolloMissiontriumphsonthe18,almost25
4、0,000milesaway,humanshave19gonefartherthan400,000milesfromtheplanet,lessthanaday´sdrive,althoughstraightup.Humansflynearhomeforseveralreasons.Thereisthelogistics（后勤）ofsendinghumansandwhattheyneed,likewater,airandfood,inaclosedenvironmentthatkeepsthem20.1.A）humansB）starsC）planetsD）robots2.A）en
5、closedB）screenedC）isolatedD）sheltered3.A）whetherB）whyC）ifD）that4.A）MoreoverB）IfC）ButD）As5.A）provideB）poseC）putonD）perform6.A）relatedB）contrastedC）comparedD）referred7.A）UnmannedmissionsB）SpaceShuttleColumbiaC）SpacetoursD）ApolloMission8.A）expeditionsB）explorationsC）investigationsD）researches9.A
6、）whichB）thatC）whereD）as10.A）putB）suggestedC）posedD）raisinghttp://www.tdxl.cn/11.A）RobotsB）HumansC）AstronautsD）Astronomers12.A）skyB）heavensC）moonsD）atmosphere13.A）alsoB）evenC）stillD）only14.A）universeB）solarsystemC）spaceD）moon15.A）consequentlyB）henceC）atanyrateD）ontheotherhand16.A）seldomB）never
7、C）barelyD）almost17.A）BesidesB）ExceptC）ExcludingD）Otherthan18.A）MarsB）moonC）planetD）Jupiter19.A）neverB）seldomC）onceD）ever20.A）safeB）warmC）aliveD）active答案解析：1.A。毫无疑问，这里指人类面对充满险恶的茫茫宇宙。2.D。与地球外的空间相比，地球相对安全，因为它受到了大气等的保护，因此D项“受庇护的，受保护的”最恰当；A项意为“围住的
