阅读理解Thrilledbythesuccessfullandingoftherover（漫游者）onMars，scientistsfromNASA（theNationalAeronauticsandSpaceAdministration）havespentthelastfewdaysstudyingdatafromtherobotandworking

阅读理解

Thrilledbythesuccessfullandingoftherover（漫游者）onMars，scientistsfromNASA（theNationalAeronauticsandSpaceAdministration）havespentthelastfewdaysstudyingdatafromtherobotandworkingongettingitreadytoroll．TheSpirit（勇气号）madealandingonMars．TheSpiritmadeanerve-racking，butsafe，landingonMarsonSundayonwhatscientistsbelieveistherockybedofanancientlakethatoncemayhavecontainedlife．Justthreehourslater，thesix-wheeledroverbegansendingblack-and-whitephotosofitssurroundingsback170millionkilometrestoEarth．TheroversentbackafewcolourphotosonMonday．Thescientistswereoverjoyedbythesuccess．TwoofeverythreepastmissionstoMarshavefailed．“It'sabigstepforwardforallhumanity．Nowwehaveanotherroveronanotherplanet，exploringanewworld．Whatmorecouldyouaskfor？”saidCharlesElachi，directorofNASA'sJetPropulsionLaboratory．ThefirstimagesfromtheSpiritshowaflat，wind-damagedsurfacedottedwithsmallrocks．Thescenemadescientistseagertosendtheroveraroundtheplanetinsearchofevidencethatthelandingsitewasoncecoveredwithwater．TheUS＄820millionprojectalsoincludesatwingolfcart-sizedrovercalledOpportunity（机遇号），settolandonMars'othersideonJanuary24．Thedozensofinitial，low-resolutionphotosshowSpiritlandedupright（垂直的），levelandfacingsouthonaflatstretchoftheholethescientistsbelieveoncecontainedalake．Itwillbeaboutaweekbeforethesix-wheeledrobotisreadytorolloffitslanderandmovearoundMars．Spirit'ssuccessfullandinghasendedthetrendoffailedmissionstoMars．NASA'slastattempttolandonMars，in1999，endedinfailure．Itslastsuccessfullandingwasin1997，whenPath-finder（探险者）carriedthetinySojourner（旅居者）rovertothesurfaceofMars．

Overthenextthreemonths，therobotwillusearangeofinstrumentstolookforevidenceofpastwateractivityintherocksandsoiloftheplanet．

1．HowmanysuccessfullandshasNASAmadeonMarssofar？

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A．Five

B．Two

C．Four

D．Three

2．WecaninferthatthemainpurposeofthismissiontoMarsis________．

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A．tofindoutifthereexistslifeontheMars

B．tofindoutifwecanliveon