英语习题及参考答案

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1、英语(专科本科)习题一、阅读理解PassageOneUnlesswespendmoneytospotandpreventasteroids(小行星)now,onemightcrashintoEarthdestroylifeasweknowit,saysomescientists.Asteroidsarebiggerversionsofthemeteoroids(流星)thatraceacrossthenightsky.MostorbitthesunfarfromEarthanddon’tthreatenus.

2、ButtherearealsothousandswhoseorbitsputthemonacollisioncoursewithEarth.Buy＄50millionworthnewtelescopesrightnow.Thenspend＄10millionayearforthenext25yearstolocatemostofthespacerocks.Bythetimewespotafatalone,thescientistssay,we’llhaveawaytochangeitscourse.Somes

3、cientistsfavorpushingasteroidsoffcoursewithnuclearweapons.Butthecostwouldn’tbecheap.Isitworthit?Twothingsexpertsconsiderwhenjudginganyriskare:1)Howlikelytheeventis;and2)Howbadtheconsequencesiftheeventoccurs.Expertsthinkanasteroidbigenoughtodestroylotsoflife

4、mightstrikeEarthonceevery500,000years.Soundsprettyrare-butifonedidfall,itwouldbetheendoftheworld.“Ifwedon’ttakecareofthesebigasteroids,they’lltakecareofus,”saysonescientist.“It’sthatsimple.”Thecure,though,mightbeworsethanthedisease.Dowereallywantfleetsofnuc

5、learweaponssittingaroundonEarth?“Theworldhaslessgofearfromdoomsday(毁灭性的)rocksthanfromagreatnuclearfleetsetagainstthem,”saidaNewYorkTimesarticle.1.Whatdoesthepassagesayaboutasteroidsandmeteoroids?A.Theyareheavenlybodiesdifferentincomposition.B.Theyareheavenl

6、ybodiessimilarinnature.C.Therearemoreasteroidsthanmeteoroids.D.Asteroidsaremoremysteriousthanmeteoroids.2.WhatdoscientistssayaboutthecollisionofanasteroidwithEarth?A.Itisveryunlikelybutthedangerexists.B.Suchacollisionmightoccuronceevery25years.C.Collisionso

7、fsmallerasteroidswithEarthoccurmoreoftenthanexpected.D.It’sstilltooearlytosaywhethersuchacollisionmightoccur.3.Whatdopeoplethinkofthesuggestionofusingnuclearweaponstoalterthecourseofasteroids?A.Itsoundspracticalbutitmaynotsolvetheproblem.B.Itmaycreatemorepr

8、oblemsthanitmightsolve.C.ItisawasteofmoneybecauseacollisionofasteroidswithEarthisveryunlikely.D.Furtherresearchshouldbedonebeforeitisprovedapplicable.4.WecanconcludefromthepassagethatA.Whilepushingaste