mars( 火星) appears to be flowing with small阅读理解答案

《mars( 火星) appears to be flowing with small阅读理解答案》由会员上传分享，免费在线阅读，更多相关内容在应用文档-天天文库。

1、Mars(火星)appearstobeflowingwithsmall阅读理解答案　　Mars(火星)appearstobeflowingwithsmallstreamsofsaltywater,atleastinthe　　summer,scientistsreportedMonday.“Itsuggeststhat.itwouldbepossibleforthereto　　belifetodayonMars,”NASA’ssciencemissionchief,JohnGrunsfeld,saidatanews　　conferenceonSep

2、tember28,2015.　　Thestreamsareabout12to15feetwideand300feetormorelong,scientistssaid.　　”Whatwe’redealingwithiswetsoil.thinlayersofwetsoil,notstandingwater,”said　　AifredMcEwenoftheUniversityofArizonaatTueson!theprincipalscientistforthe　　MarsReconnaissanceOrbiter’shigh-resolutio

3、nimagingexperiment.　　Becauseliquidwaterisessentialtolife,thefindingscouldhavemajorimplications　　forthepossibilityofMartianlife.Theresearcherssaidfurtherexplorationisneededto　　determinewhethermicroscopiclifeexistsontheplanet.　　&　　　　nbsp;Thepresenceofliquidwatercouldalsomakelif

4、eeasierforastronautsvisitingor　　livingonMars.Watercouldbeusedfordrinkingandforcreatingoxygenandrocket　　fuel.NASA’sgoalistosendhumansthereinthe2030s.　　Theevidenceofflowingwaterconsistslargelyofdark,narrowstreaks(条痕)on　　thesurfacethattendtoappearandgrowduringthewarmestMartianmo

5、nthsandfade　　therestoftheyear.　　Marsisextremelycoldeveninsummer,andthestreaksareinplaceswherethe　　temperatureisaslowasminus10degreesFahrenheit.Butsaltcanlowerthefreezing　　pointofwaterandmeltice.　　Thesourceofthewaterisamystery.Scientistsnoteditcouldbemelting　　ice.Itcouldbeanun

6、dergroundaquifer,whichisrockorsandthatcanholdwater.Itis　　possiblywatervaporfromthethinMartianatmosphere,Oritmaybeac　　　　ombination　　MichaelMeyer,leadscientistforNASA’sMarsexplorationprogram,saidtheonly　　definitivewayfornowtodeterminewhetherthere’slifeonMarsistocollectrocksand　

7、　soilforanalysisonEarth-somethingaU.S.landersetforlift-offin2020willdo.　　28.Whatwouldbethebesttitleforthetext?‘　　AStreamsofWaterSpottedonMarsB.AstronautswillLandonMars　　C.NASA’sMarsExplorationProgramD.ABreakthroughintheExplorationofMars　　29.AccordingtoJohnGrunsfeld,thereseems

8、tobeonMars.　　A.saltywaterB.standingwaterC.rocketfuelD.humanbeings　　a