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Unit4Astronomy：thescienceofthestarsPeriodOneWarmingUp&ReadingⅠ.用适当的介、副词填空1．Inoursolarsystemeightplanetscircle________thesun.2．Eachreligionandculturehasitsownideas________howlifebeganonearth.3．However，accordingtoawidelyacceptedtheory，theuniversebeganwitha“BigBang”thatthrewmatter________alldirections.4．Whatisevenmoreimportantisthatastheearthcooled________，waterbegantoappearonitssurface.5．Manymillions________yearslater，thefirstextremelysmallplantsbegantoappear________thesurfaceofthewater.6．Laterwhentheplantsgrew________forests，reptilesappeared________thefirsttime.7．Finallyabout2.6millionyearsagosomesmallcleveranimals，now________handsandfeet，appearedandspreadall________theearth.8．Asaresultofthis，manyscientistsbelievetheearthmaybecometoohottolive________.Ⅱ.佳句翻译与仿写1．Whatitwastobecomewasuncertainuntilbetween4.5and3.8billionyearsagowhenthedustsettledintoasolidglobe.翻译________________________________________________________________________________________________________________________________________________仿写(1)他们什么时候上交计划？________________________________________________________________________(2)她一定会因这项伟大的工作被授予荣誉的。________________________________________________________________________2．Thisproducedachainreaction，whichmadeitpossibleforlifetodevelop.翻译________________________________________________________________________________________________________________________________________________仿写(1)我必须说清楚，我会一直支持你的。________________________________________________________________________________________________________________________________________________(2)他发现不可能继续在德国工作了。________________________________________________________________________________________________________________________________________________3．Somewereinsects.Others，calledamphibians，wereabletoliveonlandaswellasinthewater.翻译________________________________________________________________________________________________________________________________________________仿写(1)学生和老师都很兴奋。________________________________________________________________________(2)她英语说得和当地人说得一样好。________________________________________________________________________4．Whytheysuddenlydisappearedstillremainsamystery.翻译________________________________________________________________________仿写(1)实际上，工作还没有完成。________________________________________________________________________(2)女士们先生们，飞机停稳之前请坐着别动。________________________________________________________________________________________________________________________________________________Ⅲ.单项填空1．However，accordingtoa________acceptedtheory，theuniversebeganwitha“BigBang”thatthrewmatterinalldirections.A．closelyB．widelyC．hardlyD．highly2．Theearthbecameso________thatitwasnotclearwhethertheshapewouldlastornot.A．peacefulB．spiritualC．violentD．interested3．WaterhadalsoappearedonotherplanetslikeMarsbut，________theearth，ithaddisappearedlater.A．unlikeB．dislikeC．liketoD．like4．Whatmanyscientistsbelieveisthatthecontinuedpresenceofwaterallowedtheearthtodissolve________gasesandacidsintotheoceansandseas.A．harmB．harmlessC．usefulD．harmful5．They________andfilledtheoceansandseaswithoxygen，whichencouragedthelaterdevelopmentofearlyshellfishandallsortsoffish.A．decreasedB．developedC．multipliedD．deduced6．Theylaideggstooand________ontheearthformorethan140millionyears.A．existenceB．existedC．formedD．consisted7．Theseanimalsweredifferentfromalllifeformsinthepast，becausethey________youngbabyanimalsandproducedmilktofeedthem.A．keptrecordsofB．sangpraiseforC．gavearewardtoD．gavebirthto8．Thustheyhave，________，becomethemostimportantanimalsontheplanet.A．intheirturnB．incaseC．indoubtD．inshort9．Theyareputtingtoomuchcarbondioxideintotheatmosphere，whichpreventsheat________escapingfromtheearthintospace.A．intoB．outofC．fromD．to10．So________lifewillcontinueontheearthformillionsofyearstocomewilldependon________thisproblemcanbesolved.A．if；whetherB．whether；whetherC．if；thatD．if；ifⅣ.阅读理解Scientistshavefoundanunusualwaytopreventourplanetfromoverheating：moveittoacoolerspot.Allyouhavetodoissendafewcomets(彗星)inthedirectionofEarth，anditsorbitwillbechanged.Ourworldwillthenbesentintoasafer，colderpartofthesolarsystem.ThisideaforimprovingourclimatecomesfromagroupofUSNationalAeronauticsandSpaceAdministration(NASA)engineersandAmericanastronomers.Theysaytheirplancouldaddanothersixbillionyearstotheusefullifetimeofourplanet—effectivelydoublingitsworkinglife.TheplanputforwardbyDr.Laughlin，andhiscolleaguesDonKorycanskyandFredAdams，needscarefullydirectingacometofasteroid(小行星)sothatitpassesclosebyourplanetandsendssomeofitsgravitationalenergytoEarth.“Earth’sorbitalspeedwouldincreaseasaresultandwewouldmovetoahigherorbitawayfromtheSun，”Laughlinsaid.EngineerswouldthendirecttheircometsothatitpassedclosetoJupiterorSaturn.Thecometwouldpickupenergyfromoneofthesegiantplanets.LateritsorbitwouldbringitbacktoEarth，andtheprocesswouldberepeated.Intheshortterm，theplanprovidesanidealwaytoglobalwarming，althoughtheteamwasactuallyconcernedwithamuchgreaterdanger.Thesuniscertaintoheatupinaboutabillionyearsandso“serious