最终Unit4How life began on the earth阅读课件.ppt

Howlifebeganontheearth,Pangu_theskyfromtheearth.,盘古开天辟地,Saying1,separated,女娲补天,Nuwamendedtheheavenand_humanbeings.,Saying2,created,God_theworldinsevendays.,Saying3,created,ThedevelopmentofHumanfrom_.,Saying4,monkey,LifewasbroughttotheearthbyETfrom_space.,Saying5,outer,1.Whatdoesthetexttellus?,HowtheearthcomeintobeingTheproblemoftheearthcausedbyhumanbeingHowthehumanbeingbuildtheearthHowthelifedevelopedontheearth,Task1Fastreading,Readthepassagequicklyandfindouttheanswerstothequestionsbelow.,Task1skimming,2.Howdidtheuniversebeginaccordingtoawidelyacceptedtheory?,TheuniversebeganwithaBigBang.,Task1Fastreading,Task1skimming,WhatsthemainideaforeachPara?,Para.1Para.2Para.3Para.4Para.5,Atheoryabouthowtheuniversebegan,Thearrivalofhumansandtheirimpact（影响）ontheearth,Theimportanceofwaterforlife,Thedevelopmentofplantsandanimalsontheearth,Theformation(形成)ofatmosphereandwateronearth,Task2carefulreading,Tobehonest,noneofusknowshowtheearthbeganbecauseithappenedtoolongago.,True,JudgeTrueorFalse,Para.1,Task3Carefulreading,Para.1,HowdidtheBigBangcreatetheuniverse?,Firstofall,it_matterinall_.Afterthat,_beganto_.Then,atoms_tocreate_and_.,threw,directions,atoms,form,combined,stars,otherbodies,Para.2,1.Whatistheoriginalearthsatmospheremadeupof?,carbon,nitrogen,watervapour,andothergases,Theoriginoflifeontheearthisaninterestingquestion.Itwasawidelyaccepted_thattheuniversebeganwitha“BigBang”,afterwhichtheearthwas_.Between4.5and3.8billionyearsagoitsettledintoasolid_.Theearthwasvery_andexplodedloudlywithfireandrock.theywereintimetoproducecarbon,nitrogen,watervaporandothergases,whichweretomaketheearths_.Thenastheearthcooleddown,waterappeared.,theory,acloudofdust,globe,violent,atmosphere,Fillintheblanks:,Para.2,1.Whatmakestheearthdifferentfromtheotherplanetsinthesolarsystem?A.Itproducedalotofheat.B.C.Waterdisappeared.D.Itwastheoldestplanet.,Thecontinuedpresenceofwater,Para.3,2.Howdidwaterhelplifedevelop?,Waterallowedtheearthto_harmfulgasesandacidsintotheoceansandseas,producinga_.,dissolve,chainreaction,Para.3,1.insects2.plants3.reptiles（爬行类）4.shellfish（贝类）5.fish6.amphibians（两栖类）7.mammals(哺乳类),Lookatthepicturesandtellthegroups.,Para.4,1.insects2.plants3.reptiles（爬行类）4.shellfish（贝类）5.fish6.amphibians（两栖类）7.mammals(哺乳类),StudyofthegroupsoflifeLookatthepicturesandtellthegroups.,1.insects2.plants3.reptiles（爬行类）4.shellfish（贝类）5.fish6.amphibians（两栖类）7.mammals(哺乳类),Studyofthegroupsoflife(生命的种类/物种)Lookatthepicturesandtellthegroups.,1.insects2.plants3.reptiles（爬行类）4.shellfish（贝类）5.fish6.amphibians（两栖类）7.mammals(哺乳类),Studyofthegroupsoflife(生命的种类/物种)Lookatthepicturesandtellthegroups.,1.insects2.plants3.reptiles（爬行类）4.shellfish（贝类）5.fish6.amphibians（两栖类）7.mammals(哺乳类),Studyofthegroupsoflife(生命的种类/物种)Lookatthepicturesandtellthegroups.,1.insects2.plants3.reptiles（爬行类）4.shellfish（贝类）5.fish6.amphibians（两栖类）7.mammals(哺乳类),Studyofthegroupsoflife(生命的种类/物种)Lookatthepicturesandtellthegroups.,1.insects2.plants3.reptiles（爬行类）4.shellfish（贝类）5.fish6.amphibians（两栖类）7.mammals(哺乳类),Studyofthegroupsoflife(生命的种类/物种)Lookatthepicturesandtellthegroups.,1.insects2.plants3.reptiles（爬行类）4.shellfish（贝类）5.fish6.amphibians（两栖类）7.mammals(哺乳类),Studyofthegroupsoflife(生命的种类/物种)Lookatthepicturesandtellthegroups.,Humanbeings,Usethesentenceinthetexttodescribethepicture:,Theyareputtingtoomuchcarbondioxideintotheatmosphere,whichpreventsheatfromescapingfromtheearthintospace.,Para.5,greenhouseeffect,Theearthmaybecometoohottoliveon.,Finallyabout_millionyearsagosomesmall_animals_,buttheyputlotsofcarbonintotheatmosphere,_heatescapingfromtheearthintospace.Asaresultofit,lifeonearthisi_d_.,appeared,preventing,nanger,clever,Summary,Para.5,2.6,Groupcompetition,1,2,5,4,3,6,Howtheearthcameout,acloudof_,BigBang,asolid_,slowlycombine,theearth_down,itexplodedloudlywith_and_,water,theearths_,Fillingexercise(Para.1-2)(6),dust,ball/globe,firerock,atmosphere,cooled,Howlifebeganontheearth,water,1.,2.,10.,3.,4.insects(onland)5.,6.,7._8.dinosaurs(onland)9._,11._,small_inwater,_andallsortsoffish,greenplantsonland,_(onlandandinwater),forests,(onland),(onland),smallcleveranimalswith_,Fillingexercise(Para.4)(7),plants,shellfish,amphibians,reptiles,mammals,handsandfeet,humanbeings,Questions:,Howdidwatercomeintobeingontheearth?(Para.2)(2)2)Whyisimportanttohavewaterontheearth?(Para.3)(2),Theexplosionoftheearthproducedwatervapour,whichturnedintowaterwhentheearthcooleddown.,Itallowedtheearthtodissolveharmfulgasesintooceansandseas.,Translation,Itwasnotimmediatelyobviousthatwaterwastobefundamentaltothedevelopmentoflife.(4),水会对生命的发展起关键作用，这一点在当时并不明显。,Insomefilmsandstories,wecanseedinosaursandpeopletogether.Isitright?Why?(Para.4)(4),Becausedinosaursdiedoutlongbeforehumanbeingsdevelopedontheearth.,insectsandamphibiansappearB.reptilesappearC.shellfishandotherfishappearD.dinosaursappearE.smallplantsgrowonthewaterF.plantsbegintogrowonlandG.Mammals(includinghumans)appear,Puttheminacorrectorder!,Para.4,E,C,F,A,B,D,G,(4),Homework,1.Retellthedevelopmentoflife.,2.Reviewthenewwordsandexpressionsinthisunit.,usethevocabularyfromthereadingpassagetoreplacetheunderlinedparts,1.However,accordingtoawell-knowntheory,theuniversestartedwithagreatexplosion.However,accordingtoawidelyacceptedtheory,theuniversebeganwitha“BigBang”.,2.TheBigBangthrewmatterineverydirection.TheBigBangthrewmatterinalldirections.,3.Theywerefinallytoproducecarbon,nitrogen,watervapourandothergases.Theywereintimetoproducecarbon,nitrogen,watervapourandothergases.,4.Itwasnotimmediatelyobviousthatwaterwastobebasictothedevelopmentoflifefundamental,5.Theextremelysmallplantsspreadandmadetheoceansandseasfilledwithoxygen.,Theextremelysmallplantsmultipliedandfilledtheoceansandseaswithoxygen.,6.Whytheysuddenlydiedoutstillremainsapuzzle?Whytheysuddenlydisappeared/extinctedstillremainsamystery.,7.Thisdisappearancemadepossibletheappearanceofmammalsontheearth.rise,8.Therefore,itstheirturntobecomethemostimportantanimalsontheplanet.Thus,intheirturn,theybecomethe,Toliveontheearthmaybecometoohot.Theearthmaybecometoohottoliveon.,fillintheblankwithproperwh-,orthat.,1.(_itwastobecome)wasuncertainuntilbetween4.5and3.8billionyearsago(_thedustsettledintoasolidglobe).,what,when,2.Theearthbecamesoviolentthatitwasnotclear(_theshapeofbeingasolidglobewouldlastornot).3.Theywereintimetoproducecarbon,nitrogen,watervapourandothergases,(_weretomaketheearthsatmosphere).