阅读理解.Whileallmyclassmatesseemtobecrazyaboutaone-waytickettoMars(火星),I'drathersayMarsistotallyunsuitableforhumanexistence.Peoplewon'thaveenoughfoodsuppliesthere,andtheterribleenvironmentwouldmake

　　阅读理解. Whileallmyclassmatesseemtobecrazyaboutaone-waytickettoMars(火星),I'drathersayMarsis

　　totallyunsuitableforhumanexistence.Peoplewon'thaveenoughfoodsuppliesthere,andtheterrible

　　environmentwouldmakeitimpossibleforthemtolivealonglife.Besides,thejourneywon'tbesafe.Can

　　anybodyexplaintomejustwhypeoplewouldgotoMars,nevertoreturn?

　　SteveMinear,UK

　　Herearethethingsyoucanthinkof:thedesiretoexploreaforeignanduniqueenvironment,theexcitement

　　ofbeingthefirsthumanstoopenupanewworld,theexpectationoffameandglory…Forscientiststhereis

　　anotherreason.Theirobservationsandresearchwillprobablyleadtogreatscientificachievements.

　　DonalTrollop,Canada

　　TherearealreadytoomanypeopleontheEarth.Ithinkthatsometimebeforetheendofthecentury,there

　　willbeahumancolony(殖民地)onMars.Itwillhappenwhenpeoplefinallyrealizethattwo-waytripstothe

　　redplanetMarsareunnecessary.MostofthedangerofspaceFlightisinthelaunches(发射)andlandings.

　　Cuttingthetriphomewouldthereforereducethedangerofaccidents,savealotofmoney,andopentheway

　　tobuildinganeverlastinghumansettlementonanotherworld.

　　Enoughsuppliescanbesentonahead.Andeverytwoyearsmoresuppliesandmorepeoplewillbeneeded,

　　andMarsisfarmorepleasantthantheotherplanetsintheouterspace.

　　PaulDavies.USA1.ThemainpurposeofSteveMinear'swritingis_____.[ ]A.toreporthisclassmates'discussion

　　B.toinviteananswertohisquestion

　　C.toexplainthenaturalstateofMars

　　D.toshowhisagreementongoingtoMars2.WhichofthefollowingbeststatesDonalTrollop'sidea?[ ]A.ThereisaplantosendhumanstoMars.

　　B.TherearemanyreasonsforgoingtoMars.

　　C.ScientistsbecomefamousbydoingresearchonMars.

　　D.Itispos