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双基限时练(十)Unit4PartⅠⅠ.单词拼写1.Hewasinterestedina________andalwaysstayedupatnighttowatchthestars.答案astronomy2.OnMay12,2008,anv________earthquakestruckWenchuanCounty,Sichuan,China.答案violent3.Computerhackershavebrokendownsecuritys________，raisingquestionsaboutthesafetyofinformation.答案system4.Themixtureofgasesthatsurroundtheearthiscalleda________.答案atmosphere5.Formingagoodhabitofstudyingis________(基础)toone'sachievementsintheyearstocome.答案fundamental6.Hestucktohis________(理论)anditprovedtobecorrectatlast.答案theory7.Thisproduces________(连串)ofreactions.答案chain8.Smokingish________toyourhealth.答案harmful9.Ifyoum________4by5,theansweris20.答案multiply10.Nowwestilldon'tknowwhetherlifee________onMars.答案existsⅡ.单句语法填空(不多于3个单词)1．Iadviseyoutogiveupsmoking,forsmokingis________(harm)tohealth.答案与解析harmful句意：我建议你戒烟，因为抽烟有害健康。此处应填其形容词形式。2．Weusuallytaketurns________(do)cleaning,andtodayitismyturn________(do)it.答案与解析todo;todo考查搭配taketurnstodosth.“轮流干某事”及Itisone'sturntodosth.“轮到某人干某事”。3．Thereisa________(puzzle)lookonherface.Actually,shefelt________(puzzle)aboutallofthis.答案与解析puzzled;puzzledpuzzled“感到困惑的”，puzzling“令人困惑的”。4．Thenovelwrittenbytheauthorsellsbest,butfiveyearsagonoonecouldhaveimaginedhowgreatarolehewas________(play)intheliteraryworld.答案与解析toplaywastoplay表示后来将要发生的事情。5．________Alicewillbeabletogethelpfortherescueisnotcertainyet.答案与解析Whetherwhether(是否)在句中引导主语从句。if作“是否”解，引导主语从句时，从句不能位于句首。6．AsthebusiestwomaninNorton,shemade________herdutytolookafteralltheotherpeople'saffairsinthattown.答案与解析itit在句中作形式宾语，真正的宾语为后面的不定式短语。7．Cindydidn'tleavetheofficelastnight________shefinishedherjob.答案与解析until句意：辛迪昨晚直到完成了工作才离开办公室。not...until“直到……才”，until引导的时间状语从句中用短暂性动词。8．Althoughthetrafficwasheavy,Imanagedtobe________timefortheimportantlecture.答案与解析in句意：尽管遇到了交通堵塞，我还是设法及时地参加了那个重要的讲座。intime“及时”，符合句意。9．Beforeshegoestoclass,sheusuallychainsherbike________atree.答案与解析tochain...to...“用链子把……拴在……上”。10．Itis________(unlike)thathewillcometohelpsoonbecausehehasjustgoneout.答案与解析unlikely此句考查句型Itislikely/unlikelythat...根据语意，应为“不可能”之意。11．Theykeptthedoorofthehouse________(lock),sonobodycouldgetinthroughit.答案与解析locked此处考查“keep＋宾语＋宾补”结构。lock与door为动宾关系，故用过去分词作补语。12．Thedirection________whichthepresidentwouldgowaskeptsecret________safetyconcern.答案与解析in;for句意：为了安全起见，总统的去向保密。第一空用in,in...direction表示“向某个方向”。第二空用for,for...concern表示“出于……的考虑”。Ⅲ.同义句转换1.HecametoBeijingforthefirsttime.→Itisthefirsttimethathe________been________Beijing.答案has;in2.MyclassmatesaswellasIwenttotheparkyesterday.→Myclassmateswenttotheparkyesterday.Iwent________________.答案aswell3.Youwillregretsoonerorlater.→Youwillregret________________.答案intime4.Mylittlesonfilledthetankwithwater.→Thetankwas________________water.答案fullof5.Thereisadifferencebetweenthisbookandthatone.→Thisbook________________________thatone.答案isdifferentfromⅣ.根据课文内容，完成语法填空According__1__awidelyacceptedtheory,theuniversebeganwitha“BigBang”.Forseveralbillionyearsafterthe“BigBang”，theearthwasstilljustacloudofdust,__2__settledintoasolidglobe.Theearthbecamevery__3__(violence),andlateritproducedmanygases,whichwere__4__(make)theearth'satmosphere.Waterhadalsoappearedontheearth,whichallowedtheearthtodissolve__5__(harm)gases__6__acidsintotheoceansandseas.Thenlifebegantodevelop.__7__understoodplantswerethestartofchanges.Theymultipliedandfilledtheoceansandseas.Smalllandanimalsappearedandproducedyounggenerallyby__8__(lay)eggs.Afterthat,somehugeanimalsexistedontheearthformorethan140millionyears.Mammalsweredifferentfromalllifeformsinthepast;theygavebirth__9__theyoungbabyanimalsandproducedmilktofeedthem.Theyareputtingtoomuchcarbondioxideintotheatmosphere,whichpreventsheatfromescaping__10__theearthintospace.1．________2.________3.________4.________5．________6.________7.________8.________9．________10.________答案1.to2.which3.violent4.tomake5.harmful6．and7.Nobody8.laying9.to10.fromⅤ.阅读理解AEdmundHalleywasanEnglishscientistwholivedover200yearsago.Hestudiedtheobservationsofcomets(彗星)whichotherscientistshadmade.Theorbitofoneparticularcometwasaverydifficultmathematicalproblem.Hecouldnotfigureitout.Neithercouldotherscientistswhodealtwithsuchproblem.However,HalleyhadafriendnamedIsaacNewton,whowasabrilliantmathematician.Newtonthoughthehadalreadyworkedoutthatproblem,buthecouldnotfindthepapersonwhichhehaddoneit.HetoldHalleythattheorbitofacomethadtheshapeofanellipse(椭圆形)．NowHalleysettowork.Hefiguredout(计算出)theorbitsofsomeofthecometsthathadbeenobservedbyscientists.Hemadeasurprisingdiscovery.Thecometsthathadappearedintheyears1531,1607,and1682allhadthesameorbit.Yettheirappearanceshadbeen75to76yearsapart.ThisseemedverystrangetoHalley.Threedifferentcometsfollowedthesameorbit.ThemoreHalleythoughtaboutit,themorehethoughtthattherehadnotbeenthreedifferentcomets,aspeoplethought.Hedecidedthattheyhadsimplyseenthesamecometthreetimes.Thecomethadgoneawayandhadcomebackagain.Itwasanastonishingidea!Halleyfeltcertainenoughtomakeaprediction(预言)ofwhatwouldhappeninthefuture.Hedecidedthatthiscometwouldappearintheyear1758.Therewere53yearstogobeforeHalley'spredictioncouldbetested.In1758thecometappearedinthe