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1、限时训练——阅读理解之说明文1.【•湖北卷】Theoddnessoflifeinspaceneverquitegoesaway.Herearesomeexamples.Firstconsidersomethingassimpleassleep.Itspositionpresentsitsownchallenges.Themainquestioniswhetheryouwantyourarmsinsideoroutsidethesleepingbag.Ifyouleaveyourarmsout,theyfloatfreeinzerogravi
2、ty,oftengivingasleepingastronautthelookofafunnyballed（芭蕾）dancer.“I’maninsideguy,”MikeHopkinssays,whoreturnedfromasix-monthtourontheInternationalSpaceStation.“Iliketobewrappedup.”Onthestation,theordinarybecomesstrange.TheexercisebikefortheAmericanastronautshasnohandlebars.I
3、talsohasnoseat.Withnogravity,it’sjustaseasytopedalviolently.Youcanwatchamoviewhileyoupedalbyfloatingamicrocomputeranywhereyouwant.Butstationresidentshavetobecarefulaboutstayinginoneplacetoolong.Withoutgravitytohelpcirculateair,thecarbondioxideyouexhale(呼气)hasatendencytofor
4、maninvisible（隐形的）cloudaroundyouhead.Youcanendupwithwhatastronautscallacarbon-dioxideheadache.LeroyChiao,54,anAmericanretiredastronautafterfourflights,describeswhathappensevenbeforeyoufloatoutofyourseat,”Yourinnerearthinksyour’refalling.Meanwhileyoureyesaretellingyouyou’res
5、tandingstraight.Thatcanbeannoying—that’swhysomepeoplefeelsick.”Withinacoupledays—trulyterribledaysforsome—astronauts’brainslearntoignorethepanickysignalsfromtheinnerear,andspacesicknessdisappears.Spacetravelcanbesodelightfulbutatthesametimeinvisiblydangerous.Forinstance,as
6、tronautslosebonemass.That’swhyexerciseisconsideredsovitalthatNationalAeronauticsandSpaceAdministration(NASA)putsitrightontheworkdayschedule.Thefocusonfitnessisasmuchaboutscienceandthefutureasitisaboutkeepinganyindividualastronautsreturnhome,and,moreimportantly,howtomaintai
7、nstrengthandfitnessforthetwoandahalfyearsormorethatitwouldtaketomakearound-triptoMars.1.Whatisthemajorchallengetoastronautswhentheysleepinspace?A.DecidingonapropersleeppositionB.ChoosingacomfortablesleepingbagC.SeekingawaytofallasleepquicklyD.Findingarighttimetogotosleep.2
8、.Theastronautswillsufferfromacarbon-dioxideheadachewhen_____.A.theycirclearoundontheirbik
