中考英语：完形填空及阅读理解第汇编02【答案】.doc

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1、2012中考英语：完形填空及阅读理解第汇编02【答案】Unlesswespendmoneytospot(认出，发现)andpreventasteroids(小行星)now,onemightcrashintoEarthanddestroylifeasweknowit,saysomescientists.Asteroidsarebiggerversionsofthemeteoroids(流星体)thatraceacrossthenightsky.MostorbitthesunfarfromEarthanddon’tt

2、hreatenus.ButtherearealsothousandsofasteroidswhoseorbitsputthemonacollisioncoursewithEarth.But$500millionworthofnewtelescopesrightnow,thenspend$10millionayearforthenext25yearstolocatemostofthespacerocks.Bythetimewespotafatalone,thescientistssay,we’llhaveawayt

3、ochangeitscourse.Isitworthit?Twothingsexpertsconsiderwhenjudginganyriskare(i)Howlikelytheeventis;(2)Howbadtheconsequencesiftheeventoccurs.ExpertsthinkanasteroidbigenoughtodestroylotsoflifemightstrikeEarthonceevery500,000years.Soundsprettyrarebutifonedidfall.I

4、twouldbetheendoftheworld.“Ifwedon’ttakecareofthesebidasteroids,they’lltakecareofus,”saysonescientist.“it’sthatsimple.”Thecure,though,mightbeworsethanthedisease.Dowereallywantfleets(舰队，车队)ofnuclearweaponssittingaroundonEarth?“theworldhaslessfearfromdoomsday(毁灭

5、性)rocksthanfromagreatnuclearfleetsetagainstthem.”SaidaNewYorkTimesarticle.1.Whatdoesthepassagesayaboutasteroidsandmeteoroids?A.Theyareheavenlybodiesdifferentincomposition.B.Theyareheavenlybodiessimilarinnature.C.Theyaremoreasteroidsthanmeteoroids.D.Asteroidsa

6、remoremysteriousthanmeteoroids.1.WhatdoscientistssayaboutthecollisionofanasteroidwithEarth?A.Itisveryunlikelybutthedangerexists.B.Suchacollisionmightoccuronceevery25years.C.CollisionsofsmallerasteroidswithEarthoccurmoreoftenthanexpected.D.It’sstilltooearlytos

7、aywhethersuchacollisionmightoccur.2.Whatdopeoplethinkofthesuggestionofusingnuclearweaponstoalterthecourseofasteroids?A.Itsoundspracticalbutitmaynotsolvetheproblem.B.Itmaycreatemoreproblemsthanitmightsolve.C.ItisawasteofmoneybecauseacollisionofasteroidswithEar

8、thisveryunlikely.D.Furtherresearchshouldbedonebeforeitisprovedapplicable.3.Wecanconcludefromthepassagethat__A.Whilepushingasteroidsoffcoursenuclearweaponswoulddestroytheworld.B.Asteroidsr