中考英语专项突破：阅读理解精练(48)

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1、中考英语专项突破：阅读理解精练(48)　　Unlesswespendmoneytospotandpreventasteroidsnow，onemightcrashintoEarthanddestroylifeasweknowit，saysomescientists.　　Asteroidsarebiggerversionsofthemeteoroidsthatraceacrossthenightsky.MostorbitthesunfarfromEarthanddon‘tthreatenus.Buttherearealsothousandsofasteroidswhoseorbitsputthe

2、monacollisioncoursewithEarth.　　But$500millionworthofnewtelescopesrightnow，thenspend$10millionayearforthenext25yearstolocatemostofthespacerocks.Bythetimewespotafatalone，thescientistssay，we‘llhaveawaytochangeitscourse.　　Isitworthit？TwothingsexpertsconsiderwhenjudginganyriskareHowlikelytheeventis；Howba

3、dtheconsequencesiftheeventoccurs.ExpertsthinkanasteroidbigenoughtodestroylotsoflifemightstrikeEarthonceevery500，000years.Soundsprettyrarebutifonedidfall.Itwouldbetheendoftheworld.“Ifwedon‘ttakecareofthesebidasteroids，they’lltakecareofus，”saysonescientist.“it‘sthatsimple.”　　Thecure，though，mightbewors

4、ethanthedisease.DowereallywantfleetsofnuclearweaponssittingaroundonEarth？“theworldhaslessfearfromdoomsdayrocksthanfromagreatnuclearfleetsetagainstthem.”SaidaNewYorkTimesarticle.　　1.Whatdoesthepassagesayaboutasteroidsandmeteoroids？　　A.Theyareheavenlybodiesdifferentincomposition.　　B.Theyareheavenlybod

5、iessimilarinnature.　　C.Theyaremoreasteroidsthanmeteoroids.　　D.Asteroidsaremoremysteriousthanmeteoroids.　　2.WhatdoscientistssayaboutthecollisionofanasteroidwithEarth？　　A.Itisveryunlikelybutthedangerexists.　　B.Suchacollisionmightoccuronceevery25years.　　C.CollisionsofsmallerasteroidswithEarthoccurmoreo

6、ftenthanexpected.　　D.It‘sstilltooearlytosaywhethersuchacollisionmightoccur.　　3.Whatdopeoplethinkofthesuggestionofusingnuclearweaponstoalterthecourseofasteroids？　　A.Itsoundspracticalbutitmaynotsolvetheproblem.　　B.Itmaycreatemoreproblemsthanitmightsolve.　　C.Itisawasteofmoneybecauseacollisionofasteroid

7、swithEarthisveryunlikely.　　D.Furtherresearchshouldbedonebeforeitisprovedapplicable.　　4.Wecanconcludefromthepassagethat__　　A.Whilepushingasteroidsoffcoursenuclearweaponswoulddestroytheworld.　　B.Asteroi