阅读理解训练题-20

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1、阅读理解训练题（二十）AAtfirstsighttheplanetMars（火星）doesnotappearverywelcomingtoanykindoflife.Ithasverylittleoxygenandwater,thetemperatureatnightisbelow-50degreesandwindsof100miles（161kilometres）perhourcausesevereduststorms.However,thesurfaceoftheplanetseemstoshowthatwaterflowedacrossitatsometimeinthe

2、past,anditisbelievedthatthereisenoughiceatthepolestocovertheplanetwithwaterifitmelted.AlthoughthereisnolifeonMarsnow,somescientiststhinkthattheremayhavebeensomeformoflifealongtimeago.Atthattime,theplanethadactivevolcanoes（火山）;theatmospherewasthickerandwarmer;andtherewaswater.Infact,insomewa

3、ysMarsmayhavebeensimilartoEarth,wherelifeexists.SomepeoplebelievethatMarscouldsupportlifeinthefutureiftherightconditionswereproduced.Thefirststepwouldbetowarmtheplanetusingcertaingaseswhichtrapthesun’sheatintheplanet’satmosphere.Withwarmth,waterandcarbondioxide（三氧化碳）,simpleplantscouldbegint

4、ogrow.TheseplantscouldslowlymakeMarsfittoliveon.Itisjudgedthatthewholeprocessmighttakebetween100,000and200,000years.Inthemeantime,peoplecouldbegintoliveontheplanetinspecialclosedenvironments.TheywouldprovidealotofusefulinformationaboutconditionsonMarsandtheproblemsconnectedwithlivingthere.5

5、6．Accordingtothepassage,theplanetMarshasnoonit.A．windB．dustC．mountainsD．animals57．ItisbelievedthatonMarsnow.A．thereisalargeamountoficeatthepoles.B．thereisathickerandwarmeratmosphereC．therearesomekindsofsimpleplantsD．therearesomanyactivevolcanoes.58．Whatisthetopicdiscussedinthesecondparagrap

6、h?A．CertaingasesshouldbeusedtowarmMars.B．PlantsshouldbegrowntomakeMarsfittoliveon.C．Marscouldsupportlifeonrightconditionsinthefuture.D．PeoplecouldliveonMarsinspecialclosedenvironments.59．Amostsuitabletitleforthepassageis.A．NolifeonMarsB．B.studyofMarsC．ThepossibilityoflifeonMarsD．TheFutureco

7、nditionsonMarsBDecember06—Canada:ForthoseofyouwhohavebeenFollowingthisstory,thethirdsuspect（嫌疑犯）intheCanadianCatMutilation（残害）casehasbeencaught.OnMarch8,afterjustunderayearofsearching,theFindMattCampaignreceivedinformationthatwouldcomfortmany.NowknownasM