高中英语学习材料（灿若寒星*制作整理）双基限时练(十)Unit4PartⅠⅠ.单句语法填空1.In2015,a________(violence)explosionhappenedinTianjin.答案violent2.Formingagoodhabitofstudyingisfundamental________one'sachievementsintheyearstocome.答案to3.Nowwestilldon'tknowwhetherlife________(exist)onMars.答案exists4．Weusuallytaketurns________(do)cleaning,andtodayitismyturn________(do)it.答案todo;todo5．Thereisa________(puzzle)lookonherface.Actually,shefelt________(puzzle)aboutallofthis.答案puzzled;puzzled6．________Alicewillbeabletogethelpfortherescueisnotcertainyet.答案Whether7．Shemade________herdutytolookaftertheoldwomaninhersparetime.答案it8．Cindydidn'tleavetheofficelastnight________shefinishedherjob.答案until9．Althoughthetrafficwasheavy,Imanagedtobe________timefortheimportantlecture.答案in10．Itis________(unlike)thathewillcometohelpsoonbecausehehasjustgoneout.答案unlikelyⅡ.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.In1758thecometappearedinthesky.Halleydidnotseeit,forhehaddiedsomeyearsbefore.EversincethenthatcomethadbeencalledHalley'scomet，inhishonour.1．EdmundHalleyfiguredouttheorbitof________.A.somedifferentcometsappearingseveraltimesB.thesamecometappearingatdifferenttimesC.threedifferentcometsappearingthreetimesD.severalcometsappearingatthesametime答案与解析B根据第四段和最后一段可得出答案。2．Halleymadehisdiscovery________.A.bydoingexperimentsB.bymeansofhisowncarefulobservationC.byusingtheworkofotherscientistsD.bychance答案与解析C根据第三段内容可知，哈雷是在计算其他科学家的数据。3．Halleymadeasurprising,butcorrectpredictionintheyear________.A.1704B.1705C.1706D.1707答案与解析B根据倒数第二段，1758－53＝1705。4．Thispassageingeneralisabout________.A.HalleyandotherscientistsB.theorbitofacometC.NewtonandHalleyD.Halleyandhisdiscovery答案与解析D全篇在讲述哈雷和哈雷彗星。BWelcometotheAstronomy(天文学)ClubofAkron(ACA)webpage.ThepurposeoftheACAistofurtheraninterestinandtopromotethestudyofthesubjectofastronomythroughtheuseoflectures,discussiongroups,publications，programsandotheractivities.TheACAwilleducatethegeneralpublicthroughmonthlyprograms.Theseprograms,lecturesandeventscovertheplanets,solar/lunarobserving,comets(彗星)showers，deepskyobjectsandsoon....
