2000年1月cet4阅读理解

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1、2000年1月大学英语四级阅读理解2000年1月大学英语四级阅读理解第1篇Unlesswespendmoneytospotandpreventasteroids(小行星)now,onemightcrashintoEarthanddestroylifeasweknowit,saysomescientists.Asteroidsarebiggerversionsofthemeteoroids(流星)thatraceacrossthenightsky.MostorbitthesunfarfromEarthanddon’tthreatenus.Buttherearealsotho

2、usandsofasteroidswhoseorbitsputthemonacollisioncoursewithEarth.Buy$50millionworthofnewtelescopesrightnow.Thenspend$10millionayearforthenext25yearstolocatemostofthespacerocks.Bythetimewespotafatalone,thescientistssay,we’llhaveawaytochangeitscourse.Somescientistsfavorpushingasteroidsoffcour

3、sewithnuclearweapons.Butthecostwouldn’tbecheap.Isitworthit?Twothingsexpertsconsiderwhenjudginganyriskre:1)Howlikelytheeventis;and2)Howbadtheconsequencesiftheeventoccurs.ExpertsthinkanasteroidbigenoughtodestroylotsoflifemightstrikeEarthonceevery500,000years.Soundsprettyrare—butifonedidfall

4、,itwouldbetheendoftheworld.“Ifwedon’ttakecareofthesebigasteroids,they’lltakecareofus,”saysonescientist.“It’sthatsimple.”Thecure,though,mightbeworsethanthedisease.DowereallywantfleetsofnuclearweaponssittingaroundonEarth?“(1)Theworldhaslesstofearfromdoomsday(毁灭性的)rocksthanfromagreatnuclearf

5、leetsetagainstthem,”saidaNewYorkTimesarticle.21.Whatdoesthepassagesayaboutasteroidsandmeteoroids?A)Theyareheavenlybodiesdifferentincomposition.B)Theyareheavenlybodiessimilarinnature.C)Therearemoreasteroidsthanmeteoroids.D)Asteroidsaremoremysteriousthanmeteoroids.（B）22.Whatdoscientistssaya

6、boutthecollisionofanasteroidwithEarth?A)Itisveryunlikelybutthedangerexists.B)Suchacollisionmightoccuronceevery25years.C)CollisionsofsmallerasteroidswithEarthoccurmoreoftenthanexpected.D)It’sstilltooearlytosaywhethersuchacollisionmightoccur.（A）23.Whatdopeoplethinkofthesuggestionofusingnucl

7、earweaponstoalterthecoursesofasteroids?A)Itsoundspracticalbutitmaynotsolvetheproblem.B)Itmaycreatemoreproblemsthanitmightsolve.C)ItisawasteofmoneybecauseacollisionofasteroidswithEarthisveryunlikely.D)Furtherresearchshouldbedonebeforeitisprovedapplicable.（B）24.Wecanc