人教版高中英语必修三第四单元《How-Life-Began-On-The-Earth》课件

人民教育出版社必修三第四单元HowLifeBeganOnTheEarthReadthetitleandlookatthepicturesonthebook.Predictwhatthereadingwillbeabout.Theoriginoflifeontheearth.Pre-reading•Nearlyeverybodyhasthisorthatpuzzles:•Howdohumanbeingscomeintobeing?•Howdoestheearthcomeintobeing?•Doyouknowanyancientideaaboutthebeginningoftheuniverse?BigBangSkimmingHowmanypartscanthistextbedividedinto?Inwhatorderisthistextwritten?Thispassagecanbedividedintotwoparts:Part1(para1-3):Thedevelopmentofearth.Part2(para4-5):Thedevelopmentoflife.lifeinthewaterlifeonthelandOrderofwriting:timeScanningReadthispassagequicklyandmatchtherightmainideaofeachparagraph.Fillintheblankstogetitsmainidea.Para.1Para.2Para.3Para.4Para.5AtheoryabouthowtheuniversewasformedTheformation(形成）oftheearthTheimportanceofwaterforlifeThedevelopmentofplantsandanimalsThearrivalofhumansandtheireffectsontheearthPart1:ThedevelopmentoftheearthPart2:Thedevelopmentoflife.HowLifeBeganOnTheEarthMainidea:Thetextmainlytellsustheformation(form)oftheearthandthedevelopment(develop)oflifeonit.While-readingPart1:ThedevelopmentoftheearthPart1:Thedevelopmentoftheearth1.AftertheBigBang,whatwastheearthlike?acloudofdustasolidglobe2.Whatmadeup(构成)theearth’satmosphereaftertheearthexploded?Carbondioxide,nitrogen,watervapourandothergases.3.Whyiswatersoimportantforthebeginningoflife?Becausewaterallowedtheearthtodissolveharmfulgasesandacidsintooceansandseas.sionproduce?AcloudofdustsettleintoasolidglobeExplode…withfire&rock(produceC,N2,H2O,andothergases)atmospherewaterappearedCooldownHowdidtheearthcomeintobeing(产生）?theedissolveharmfulgasesinto…Part2:ThedevelopmentoflifeReadpara4carefullyandmakeatimelineofthedevelopmentoflifewater1.2.10.3.4.insects(onland)5.6.7._________8.dinosaurs(onland)9._________small________inwater_________andallsortsoffishgreenplantsonland___________(onlandandinwater)forests(onland)(onland)smallcleveranimalswith______________plantsshellfishamphibiansreptilesmammalshandsandfeetAtimelineofthedevelopmentoflifeReadpara5carefullyandanswerthefollowingqestions.Whatarethesmallcleveranimals?Aretheytakingcareoftheearthverywell?Whatproblemarehumanscausing?Becausetheyareputtingtoomuchcarbondioxideintotheatmosphere,whichpreventsheatfromescapingfromtheearthintospace.Theearthmaybecometoohottoliveon.LinkinPark—WhatI'vedoneWhatwillhappenwhenweputtoomuchCO2intotheatmosphere?greenhouseeffectglobalwarminganimalswilldieoutplantswilldieoutTherewillbenolifeontheearthDiscussionriseofthesealevelicebergsandglaciersmeltAsastudent,whatlittlethingscanwedofortheearth?SuggestedAnswers:controlthepopulationPlantmoretreesStoplitteringDevelopcleanenergyGotoworkbybusratherthanbycarrecyclerubbishsavewaterandsoonGame•Let’splayagame.Supposeyouareanastronomerandyouareaskedtodeliveraspeechaboutthedevelopmentoflifeonetheearth.•Youcanrefertothechartbellowandbeginlikethis:Goodafternoon,IamDr….I’mgreatlyhonoredtobeheretogiveyouaspeechaboutthedevelopmentoflife……•Goodmorning/afternoon,IamDr….I’mgreatlyhonoredtobeheretogiveyouaspeechaboutthedevelopmentofliHowlifebeganontheearth“BigBang”acloudofdustSummaryasolidglobetheearth’satmosphereOthergassesWater:fundamentaltothedevelopmentoflifewatervapournitrogencarbonextremelysmallplandsonthesurfaceofthewaterearlyshellfishandallsortsoffishgreenplantsonlandlandanimalsinsectsamphibiansreptileshugeanimals(dinosaurs)theriseofmammalshumanbeings•Fillintheblanksaccordingtothetext.•Theearthwasjustacloudofdustafterthe“BigBang”.Theearthexploded(explode)loudlywithfireandrock.Theywereintimetoproducemanythings,whichweretomaketheearth’satmosphere.Astheearthcooleddown,waterbegantoappearonitssurface.Itallowedtheearthtodissolveharmful(harm)gases.Thenlifebegantodevelop.•Thefirstsmallplantsmultipliedandfilledtheoceansandseaswithoxygen.Thisencouragedthedevelopment(develop)ofearlyshellfishandfish.Landanimalssuchasinsects,reptiles,dinosaursandsoonappearedaftergreenplantsappeared.Smallcleveranimalsspreadallovertheearth.Theyareputtingtoomuchcarbondioxideintotheatmosphere,whichpreventsheatfromescaping(escape)fromtheearthintospace.Whetherlifewillcontinueontheearthformillionsofyearstocomewilldependonwhetherthisproblemcanbesolved.Homework•Trytoretellthispassageaccordingtothechartonyourpaper.•Writeacomposition(作文)abouthowtoprotecttheenvironment.