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第1页共5页Unit4Astronomy：thescienceoftheStars一：用适当的连词填空；1.Thefactis_______Ihavelosthisaddress.2.Goandgetyourcoat.It's_______youleftit.3.Iwonder_____youaregettingonwithyourstudies.4.Thequestionis______cancompletethedifficulttask.5.Hegotcaughtintheheavytraffic.Thatwas______hewaslate.6.__________leavestheroomlastoughttoturnoffthelight.7.__________youhavedonemightdoharmtoothers.二、完形ExploringtheautumnskyThecoolnightsofautumnarehereto___1___usthechillofwinterisnotfaroff.Alongwiththecoolair,thebrilliant___2___ofthesummertrianglefallinthewesttobereplacedwitharatherbland-lookingregionofsky.Butdon't___3___initialappearancesdeceiveyou.___4___inthefallskyaregemsequaltosummertime.TheBigDipperswingslowthis___5___,andforpartsofthesouthernUnitedStatesit___6___sets.CassiopeiatheQueen,a___7___offivebrightstarsinthe___8___ofaWorM,reachesits___9___pointoverhead,thesamespottheBigDipperreached6months___10___.TotheeastofCassiopeia,PerseustheHeroriseshigh.NestledbetweenthesetwogroupsisthewondrousDoubleCluster—NGCs869and884—afantasticsightinbinocularsoralow-powertelescope.1.A.recallB.retellC.remindD.advise2.A.starsB.planetsC.satellitesD.subjects3.A.makeB.haveC.forceD.let4.A.HiddenB.TohideC.HidingD.Appearing5.A.yearB.monthC.dayD.season6.A.trulyB.exactlyC.actuallyD.possibly7.A.teamB.classC.kindD.group8.A.formB.shapeC.figureD.formation9.A.highestB.lowestC.higherD.deepest10..A.beforeB.agoC.sinceD.later三、阅读理解InJuly1994Jupiter,thelargestplanetinoursolarsystem,wasstruckby21piecesofcomet(彗星).Whenthefragments(碎片)landedinthesouthernpartofthegiantplanet,theexplosionswerewatchedbyscientisthereonearth.Butwhatifourownplanetwashitbyacomet?第2页共5页Theyearis2094.Ithasbeenannouncedthatacometisheadingtowardstheearth.Mostofitwillmissourplanet,buttwofragmentswillprobablyhitthesouthernpartoftheearth.Thenewshascausedpanic.On17July,afragmentfourkilometerswideenterstheearth’satmospherewithahugeexplosion.Abouthalfofthefragmentisdestroyed.ButthemajorpartsurvivesandhitstheSouthAtlanticat200timesthespeedofsound.Theseaboilsandanenormouswaveiscreatedandspreads.ThewallofwaterrushestowardssouthernAfricaat800kilometersanhour.CitiesontheAfricancoastaretotallydestroyedandmillionsofpeoplearedrowned.ThewavesmovesintotheIndianOceanandheadstowardsAsia.Millionsofpeoplearealreadydeadinthesouthernpartoftheearth,butthenorthwon’tescapeforlong.Tonsofbrokenpiecesarethrownintotheatmospherebytheexplosions.Asthesunishiddenbycloudsofdust,temperaturesaroundtheworldfalltoalmostzero.Cropsareruined.Warsbreakoutascountriesfightforfood.Ayearlatercivilizationhascollapsed.Nomorethan10millionpeoplehavesurvived.Coulditreallyhappen?Infact,ithasalreadyhappenedmorethanonceinthehistoryoftheearth.Thedinosaurs(恐龙)wereontheearthforover160millionyears.Then65millionyearsagotheysuddenlydisappeared.Manyscientistsbelievedthattheearthwashitbyaspacefragment.Thedinosaurscouldn’tsurviveinthecoldclimatethatfollowedandtheybecameextinct.Willwemeetthesameend?1.WhichofthefollowinginNOTtrueaccordingtotheauthor’sdescriptionofthedisasterin2094?A.Thewholeworldbecomesextremelycold.B.AllthecoastalcitiesinAfricaaredestroyed.C.Thewholemankindbecomesextinct.D.Thevisitofthecometresultsinwar.2.Whydoestheauthormentiondinosaurattheendofthepassage?A.Becausetheycouldonlyliveinthewarmclimate.B.Becausetheyoncedominatedtheearth.C.Becausetheirextinctionindicatesfuturedisasters.D.Becausedinosaursandhumansneverliveinthesameage第3页共5页3.Inwritingthepassage,theauthorintendsto____.A.giveanaccuratedescriptionofthepossibledisasterinthefutureB.provethathumanswillsoonerorlaterbedestroyedC.tellthehistoricaldevelopmentoftheearthD.warnofapossibledisasterinthefuture4.Itcanbeconcludedthatthepassageismostprobablypartofa(n)____.A.horrorstoryB.newsreportC.researchpaperD.articleofpopularscienceBEdmundHalleywasanEnglishscientistwholivedover200yearsago.Hestudiedtheobservationsofcomets(彗星)whichotherscientistshadmade.Theorbitofoneparticularcometwasaverydifficultmathematicalproblem.Hecouldnotfigureitout.Neithercouldotherscientistswhodealtwithsuchproblems.However,HalleyhadafriendnamedIsaacNewton,whowasabrilliantmathematician.Newtonthoughthehadalreadyworkedoutthatproblem,buthecouldnotfindthepapersonwhichhehaddoneit.HetoldHalleythattheorbitofacomethadtheshapeofanellipse(椭圆形).NowHalleysettowork.Hefiguredout(解决，计算出)theorbitsofsomeofthecometsthathadbeenobservedbyscientists.Hemadeasurprisingdiscovery.Thecometsthathadappearedintheyears1531,1607,and1682allhadthesameorbit.Yettheirappearancehadbeen75to76yearsapart.ThisseemedverystrangetoHalley.Threedifferentcometsfollowedthesameorbit.ThemoreHalleythoughtaboutit,theorehisthoughtthattherehadbeenthreedifferentcometsaspeoplethought.Hedecidedthattheyhadsimplyseenthesamecometthreetimes.Thecomethadgoneawayandhadcomebackagain.Itwasanastonishingidea!Halleyfeltcertainthoughtomakeaprediction(预言)ofwhatwouldhappeninthefuture.Hedecidedthatthiswouldappearintheyear1758.Therewere53yearstogobeforeHalley’spredictioncouldbetested.In1758thecometappearedinthesky.Halleydidnotseeit,forhehaddiedsomeyearsbefore.EversincethenthatcomethadbeencalledH