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1、UnitOneIsThereLifeonEarthContentsGuided-LearningWarm-upBackgroundInformationLearning-AimsTheMainIdeaofthistextTheStructureofthistextNewwordsandexpressionsTheAnalysisofthistextTheTideRises,TheTideFallsThetiderises,thetidefalls,Thetwilightdarkens,thecur
2、lewcalls;Alongthesea-sandsdampandbrownThetravelerhastenstowardsthetown.Andthetiderises,thetidefalls,Darknesssettlesonroofsandwalls,Butthesea,theseainthedarknesscalls;Thelittlewaves,withtheirsoft,whitehands;Efface(抹掉)thefootprintsinthesands,Andthetider
3、ises,thetidefalls,Themorningbreaks,thesteeds(駿馬)intheirstallsStamp(跺腳)andneigh(馬嘶),asthehostler(馬夫)calls;Thedayreturns,butnevermoreReturnsthetravelertotheshore,Andthetiderises,thetidefalls.---HenryW.LongfellowQuestionsIstherelifeonearthinyourmind?Doyo
4、uthinkourearthhasbeenpollutedbyus?What’syourattitudetowardpollution?BackgroundInformation1.ArtBuchwald(1925-)2.ThePlanetofVenus3.Satellite4.Manhattan5.20,000lightyears6.PressConference7.skyscraper8.ZichesBackgroundInformation1.ArtBuchwald(1925-):ArtBu
5、chwaldisawell-knownAmericanhumoristandjournalistfortheWashingtonPost.HewritesapoliticalhumorcolumnthatappearsdailyinhundredsofnewspapersacrosstheUnitedStates.Hiscolumnsfrequentlydealwithstoriesaboutpoliticiansandfamouspersonalities,currenteventsinpoli
6、ticsandissuesinthenews.Someofhiswell-receivedcolumnshavebeencollectedandreprintedinbookform.2.ThePlanetofVenusVenusThesecondplanetfromthesuninthesolarsystem.Itisthebrightestobjectinoursky,afterthesunandmoon.SolarSystemVenusisthesecondplanetindistancef
7、romthesunandnearesttotheEarthofalltheplanetsinthesolarsystem.Exceptforthesunandthemoon,Venusisthebrightestobjectinthesky.Theplanetiscalled“themorningstar”whenitappearsintheeastatsunrise,and“theeveningstar”whenitisinthewestatsunset.Thesurfacetemperatur
8、eofVenusaveragesabout475degreescentigradeanditsatmosphereisabout95%carbondioxide.Oxygenisveryrare.Thehightemperatureandnearabsenceofoxygenonvenuesmakeitunlikelythatlifeasweknowitcouldexistthere.3.SatelliteAsatelliteisamanufacturedobjectthatcon
