How-life-began-on-the-earth-阅读(公开课)PPT课件

.,1,公开课附城中学唐秀霞,.,2,HowLifeBeganontheEarth,.,3,Doyouknowhowlifebeganonearthisexplainedindifferentreligionsandcultures?,.,4,Panguseparatestheskyfromtheearth,.,5,Godcreatedtheworldinsevendays,.,6,Somelegendsaboutthebeginningofuniverse.,Whatisthescientifictheoryaboutthebeginningoflifeontheearth?,Thatisthetopicwearegoingtotalkabout.Followme,Wewillgetit,.,7,Howlifebeganontheearth,Pleaseenjoyamovieabout,.,8,Readthepassagequicklytocatchthemainideaofthepassage:Topic:_Keywords:_-_-_-_,.,9,Keywords:1._2._3._4._,Wateristheheadspringoflife.,Topic:_,HowLifeBeganontheearth,air,water,plants,animals,.,10,Newwords,Theuniversebeganwitha“BigBang”.,.,11,StephenWilliamHawking,putforwardatheoryaboutblackholes.,理论，学说,i:ri,：,.,12,Themostpowerfulforceintheuniversisatomicbomb,原子的(adj),atom原子tm,.,13,Carbon,nitrogen,watervapourandotherk:bnnaitrdnveipgasesaretomaketheearhsatmosphere.,tmsfi,.,14,mltiplaiPlantsmultipliedandfilledtheoceansandseawithoxgen,.,15,amphibians,mfibinAmphibianscanliveinthewateraswellasonland.,.,16,Reptilesproducedyounggenerallybylayingeggs,reptail,.,17,mmlMammalslikemonkeysgavebirthtoyoungbabyanimalsandproducedmilktofeedthem.,.,18,fndmentlWaterwastobefundamentaltothedevelopmentoflife.,bebaseon,.,19,Waterallowedtheearthtodissovehurmfulgasesandacidsintotheoceans.Thisproducedachainreaction,whichmadeitpossibleforlifetodevelop.,.,20,k:bndaiksaidTheyareputtingtoomuchcarbondioxideintotheatmosphere,whichpreventsheatfromescapingtheearthintospace,.,21,intime及时layeggs下蛋givebirthto分娩inoneturn轮到某人prevent.from.=stopfrom,.,22,Readthetextquicklyandmatchthemainideaforeachparagraph.,Task1:Skimming,While-reading,.,23,Para.1Theformation(形成)oftheearth.Para.2Theimportanceofwaterforlife.Para.3Awidelyacceptedtheoryabouttheformationoftheuniverse.Para.4Thearrivalofhumansandtheirimpactontheearth.Para.5Thedevelopmentofplantsandanimalsontheearth.,TheBigBang,.,26,.,27,AcloudofdustCombineintoasolidballExplodewithfire&rock(produceH2O,CO2,O2,N2,othergases),atmosphere,Cooldown,waterappeared,Lifebegananddeveloped,plants-,animals,.,28,Fishandshellfish,.,29,amphibians,.,30,retiles,.,31,dinosaurs,.,32,Mammals,.,33,humanbeings,.,34,Workinpairs:Puttheorderofdevelopmentoflifeintoatimelinefirstaccordingtoyourcommonsense,andthenaccordingtothereadingpassage.,Task2:Scanning,While-reading,.,35,10,7,3,8,4,9,6,1,5,2,12,11,1.Insectsandamphibiansappeared.3.Theearthbecameasolidball.5.Reptilesappeared.7.Theearthwasacloudofdust.9.Shellfishandotherfishappeared.11.Cleveranimalswithhandsandfeetappeared.,2.Dinosaursappeared.4.Smallplantsgrewonthewater.6.Plantsbegantogrowondryland.8.Waterappearedontheearth.10.TheuniversebeganwithaBigBang.12.Mammalsappeared.,.,36,True(T)orFalse(F).1.TheearthappearedbeforetheBigBanghappened.2.Theoriginalatmosphereconsistedofnitrogenandoxygen.3.Themaindifferencebetweentheearthandotherplanetsisthatthereiswaterontheearth.4.Lifebeganinwaterandthenonland.,F,F,T,T,Discussingroups:,.,37,5.Mammalsappearedbeforethedevelopmentofdinosaurs.6.Dinosaurscouldgivebirthtoyoungbabyanimalsandproducedmilktofeedthem.7.Humanbeingsproducetoomuchcarbondioxidewhichcausestheglobalwarmingontheearth.8.Accordingtothetext,humanbeingswoulddisappearintheend.,F,F,T,F,.,38,1.Whatwasthereontheearthbeforelifecouldbegin?,2.Whydoscientiststhinktherehasneverbeenlifeonthemoon?,3.Whydidanimalsfirstappearintheseas?,4.Whydidgreenplantshelplifetodevelop?,5.Whyweremammalsdifferentfromotheranimals?,Answerthefollowingquestions:,.,39,1.Whatwasthereontheearthbeforelifecouldbegin?Water_,carbon_,o_,nitrogenandothergases.,vapour,dioxide,oxygen,.,40,2.Whydoscientiststhinktherehasneverbeenlifeonthemoon?Becausethereisno_onthemoon.3.Whydidanimalsfirstappearintheseas?Becausewaterallowedtheearthto_intotheoceansandseas.,water,dissolveharmfulgases,.,41,4.Whydidgreenplantshelplifetodevelop?Becausegreenplantscantake_fromtheatmosphereandfilltheairwith_,carbondioxide,oxygen.,.,42,5.Whyweremammalsdifferentfromotheranimals?Theyweredifferentbecausetheygavebirthtoyoungbabyanimalsandproducedmilktofeedthem,.,43,III.Readthetextandfillintheblanksinthefollowingform.,Atoms,.,44,violent,atmosphere,presence,acids,.,45,oxygen,shellfish,amphibians,.,46,Reptiles,existed,gavebirthto,.,47,clever,dioxide,Thedevelopmentoflife,Acloudofdustasolidballpresenceofwateronthewatershellfish&othe