How-life-began-on-the-earth-阅读课件(公开课)

公开课附城中学唐秀霞HowLifeBeganontheEarthDoyouknowhowlifebeganonearthisexplainedindifferentreligionsandcultures?PanguseparatestheskyfromtheearthGodcreatedtheworldinsevendaysSomelegendsaboutthebeginningofuniverse.Whatisthescientifictheoryaboutthebeginningoflifeontheearth?Thatisthetopicwearegoingtotalkabout.Followme,WewillgetitReadthepassagequicklytocatchthemainideaofthepassage:Topic:_______________Keywords:_______--_______---_______--______Keywords:1.___________2.___________3.__________4.___________Wateristheheadspringoflife.Topic:__________________HowLifeBeganontheearthairwaterplantsanimalsNewwordsTheuniversebeganwitha“BigBang”.StephenWilliamHawking,putforwardatheoryaboutblackholes.理论，学说['θi:əri]：Themostpowerfulforceintheuniversisatomicbomb原子的(adj)atom原子['ætəm]Carbon,nitrogen,watervapourandother['kɑ:bən]['naitrədən]['veipə]gasesaretomaketheearh’satmosphere.['ætməsfiə]['mλltiplai]Plantsmultipliedandfilledtheoceansandseawithoxgen[amphibians[æm'fibiən]Amphibianscanliveinthewateraswellasonland.Reptilesproducedyounggenerallybylayingeggs['reptail]['mæməl]Mammalslikemonkeysgavebirthtoyoungbabyanimalsandproducedmilktofeedthem.[,fΛndə'mentl]Waterwastobefundamentaltothedevelopmentoflife.bebaseonWaterallowedtheearthtodissovehurmfulgasesandacidsintotheoceans.Thisproducedachainreaction,whichmadeitpossibleforlifetodevelop.['kɑ:bən][dai'ɔksaid]Theyareputtingtoomuchcarbondioxideintotheatmosphere,whichpreventsheatfromescapingtheearthintospaceintime及时layeggs下蛋givebirthto分娩inone’turn轮到某人prevent…..from….=stop…from…Readthetextquicklyandmatchthemainideaforeachparagraph.While-readingPara.1Theformation(形成)oftheearth.Para.2Theimportanceofwaterforlife.Para.3Awidelyacceptedtheoryabouttheformationoftheuniverse.Para.4Thearrivalofhumansandtheirimpactontheearth.Para.5Thedevelopmentofplantsandanimalsontheearth.TheBigBangAcloudofdustCombineintoasolidballExplode…withfire&rock(produceH2O,CO2,O2,N2,othergases)atmosphereCooldownwaterappearedLifebegananddevelopedplants-------animalsFishandshellfishamphibiansretilesdinosaursMammalshumanbeings•Workinpairs:Puttheorderofdevelopmentoflifeintoatimelinefirstaccordingtoyourcommonsense,andthenaccordingtothereadingpassage.While-reading1073849615212111.Insectsandamphibiansappeared.3.Theearthbecameasolidball.5.Reptilesappeared.7.Theearthwasacloudofdust.9.Shellfishandotherfishappeared.11.Cleveranimalswithhandsandfeetappeared.2.Dinosaursappeared.4.Smallplantsgrewonthewater.6.Plantsbegantogrowondryland.8.Waterappearedontheearth.10.TheuniversebeganwithaBigBang.12.Mammalsappeared.True(T)orFalse(F).1.TheearthappearedbeforetheBigBanghappened.2.Theoriginalatmosphereconsistedofnitrogenandoxygen.3.Themaindifferencebetweentheearthandotherplanetsisthatthereiswaterontheearth.4.Lifebeganinwaterandthenonland.FFTTDiscussingroups:5.Mammalsappearedbeforethedevelopmentofdinosaurs.6.Dinosaurscouldgivebirthtoyoungbabyanimalsandproducedmilktofeedthem.7.Humanbeingsproducetoomuchcarbondioxidewhichcausestheglobalwarmingontheearth.8.Accordingtothetext,humanbeingswoulddisappearintheend.FFTF1.Whatwasthereontheearthbeforelifecouldbegin?2.Whydoscientiststhinktherehasneverbeenlifeonthemoon?3.Whydidanimalsfirstappearintheseas?4.Whydidgreenplantshelplifetodevelop?5.Whyweremammalsdifferentfromotheranimals?Answerthefollowingquestions:1.Whatwasthereontheearthbeforelifecouldbegin?Water________,carbon________,o_______,nitrogenandothergases.vapourdioxideoxygen2.Whydoscientiststhinktherehasneverbeenlifeonthemoon?Becausethereisno_______onthemoon.3.Whydidanimalsfirstappearintheseas?Becausewaterallowedtheearthto_______________________intotheoceansandseas.waterdissolveharmfulgases4.Whydidgreenplantshelplifetodevelop?Becausegreenplantscantake_____________fromtheatmosphereandfilltheairwith___________carbondioxideoxygen.5.Whyweremammalsdifferentfromotheranimals?TheyweredifferentbecausetheygavebirthtoyoungbabyanimalsandproducedmilktofeedthemIII.Readthetextandfillintheblanksinthefollowingform.TimeWhathappenedBigBang______begantoformandcombinetocreatestarsandotherbodies.AtomsBetween4.5and3.8billionyearsago●Dustsettledintoasolidand______globe.●Theearthexplodedtoproduceits___________.●Thecontinued________ofwaterallowedtheearthtodissolveharmfulgasesand_____intotheoceansandseas.violentatmospherepresenceacidsManymillionsofyearslater●Thefirstsmallplantsonthesurfaceofthewaterproduced_______.●Early_______andallsortsoffishappeared.●Greenplantsbegantogrowonland.●Insectsand___________appeared.oxygenshellfishamphibiansManymillionsofyearslater●________appearedandtheylaideggs.●Dinosaursdeveloped,laideggsand_______formorethan140millionyears.●Mammalsroseand____________babies.ReptilesexistedgavebirthtoAbout2.6millionyearsago●Somesmall______animalswithhandsandfeetappearedandspreadallovertheearth.NowHumansproducetoomuchcarbon_______,makingtheearthtoohot.cleverdioxideThedevelopmentoflifeAcloudofdust→asolidball→presenceofwater→onthewater→shellfish&otherfish→plantsbegintogrowondryland→insectsandamphibiansappear→retilesappear→dinosaursappear→mammalsappearThedevelopmentoflifesmallplantsg