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1、阅读理解训练题（二十）AAtfirstsighttheplanetMars（火星）doesnotappearverywelcomingtoanykindoflife.Ithasverylittleoxygenandwater,thetemperatureatnightisbelow-50degreesandwindsof100miles（161kilometres）perhourcausesevereduststorms.However,thesurfaceoftheplanetseemstosho
2、wthatwaterflowedacrossitatsometimeinthepast,anditisbelievedthatthereisenoughiceatthepolestocovertheplanetwithwaterifitmelted.AlthoughthereisnolifeonMarsnow,somescientiststhinkthattheremayhavebeensomeformoflifealongtimeago.Atthattime,theplanethadactivev
3、olcanoes（火山）;theatmospherewasthickerandwarmer;andtherewaswater.Infact,insomewaysMarsmayhavebeensimilartoEarth,wherelifeexists.SomepeoplebelievethatMarscouldsupportlifeinthefutureiftherightconditionswereproduced.Thefirststepwouldbetowarmtheplanetusingce
4、rtaingaseswhichtrapthesun’sheatintheplanet’satmosphere.Withwarmth,waterandcarbondioxide（三氧化碳）,simpleplantscouldbegintogrow.TheseplantscouldslowlymakeMarsfittoliveon.Itisjudgedthatthewholeprocessmighttakebetween100,000and200,000years.Inthemeantime,peopl
5、ecouldbegintoliveontheplanetinspecialclosedenvironments.TheywouldprovidealotofusefulinformationaboutconditionsonMarsandtheproblemsconnectedwithlivingthere.56．Accordingtothepassage,theplanetMarshasnoonit.A．windB．dustC．mountainsD．animals57．Itisbelievedth
6、atonMarsnow.A．thereisalargeamountoficeatthepoles.B．thereisathickerandwarmeratmosphereC．therearesomekindsofsimpleplantsD．therearesomanyactivevolcanoes.58．Whatisthetopicdiscussedinthesecondparagraph?A．CertaingasesshouldbeusedtowarmMars.B．Plantsshouldbegr
7、owntomakeMarsfittoliveon.C．Marscouldsupportlifeonrightconditionsinthefuture.D．PeoplecouldliveonMarsinspecialclosedenvironments.59．Amostsuitabletitleforthepassageis.A．NolifeonMarsB．B.studyofMarsC．ThepossibilityoflifeonMarsD．TheFutureconditionsonMarsBDec
8、ember06—Canada:ForthoseofyouwhohavebeenFollowingthisstory,thethirdsuspect（嫌疑犯）intheCanadianCatMutilation（残害）casehasbeencaught.OnMarch8,afterjustunderayearofsearching,theFindMattCampaignreceivedinformationthatwouldcomfortmany.NowknownasM
