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1、中考英語專項突破：閱讀理解精練(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
