新课标高一英语必修三unit4 Astronomy：the science of the stars ppt课件.ppt

Unit4Astronomy:thescienceofthestars,Warmingup,Thesunisastarthatliesatthecentreofoursolarsystem,andeightplanetscirclearoundit,whatarethey?,Canyoumatchthenameswiththeplanets?,Mercury,Venus,Earth,Mars,Jupiter,Uranus,Neptune,Saturn,Thereusedtobenineplanetsinthesolarsystem,recentlyscientistshavedecidedthatoneofthemcannolongerbeconsideredaplanet.doyouknowitsnameandwhytheyremovedit?,ThenameisPluto,scientistsnowthinkitistoosmalltobecalledaplanet.,Pre-reading,Letsbeginwiththethirdoneofthemtheearth,Asweknow,theearthissurroundedbygasescalledtheatmosphere,hasonenaturalmoon.Butdoyouknowanythingabouttheoriginoflifeontheearth?,Thedevelopmentoflifeontheearth,Reading,HowLifeBeganOnTheEarth?,Maybeyoudontknowverymuch.letsseekforsomeinformationinourtext,thenanswermyquestions.,Atfirst,Whatistheearthsatmospheremadeupof?whydidscientistsbelievewaterisfundamentaltothedevelopmentoflife?Whichwerethefirstanimalsorplantsonearth?Whyweremammalsdifferentfromalllifeformsinthepast?Istherelifeonotherplanets?Why?,1.Whatistheoriginalearthsatmospheremadeupof?,carbon,nitrogen,watervapourandothergases.,2.whydidscientistsbelievewaterisfundamentaltothedevelopmentoflife?,Becausewaterallowedtheearthtodissolveharmfulgasesandacidsintotheoceansandseas,thisproducedachainreaction,whichmadeitpossibleforlifetodevelop.,3.Whichwerethefirstcreaturesorplantsonearth?4.Whyweremammalsdifferentfromalllifeformsinthepast?5.Istherelifeonotherplanets?why?,Theyweredifferentbecausetheygavebirthtotheiryoungfromtheirbodiesandproducemilktofeedthem.,Akindofsmallplants(alga).,No,thereisnowateronotherplanets.,Paragraph1(1).Theimportanceofwaterforlife.Paragraph2(2).Thearrivalofhumansandtheireffectontheearth.Paragraph3(3).Thedevelopmentofplantsandanimalsontheearth.Paragraph4(4).Theformationoftheearth.Paragraph5(5).Awidelyacceptedtheoryabouttheformationoftheuniverse.,Passagestructure,Passagestructure,Mainbody,Para1:,Para2:Para3:Para4:,Para5:,Awidelyacceptedtheoryabouttheformationoftheuniverse.,Theformationoftheearth.,Theimportanceofwaterforlife.,Thedevelopmentofplantsandanimalsontheearth.,Thearrivalofhumansandtheireffectontheearth.,Readthepassagecarefullyandanalyseitsstructure:,Universeformation,lifedevelopment,Humanbeings,Puttheorderofdevelopmentoflifeintoatimeline.,Detailedreading,10.Theuniversebeganwitha“BigBang”.,7.Theearthwasacloudofdust.,3.Theearthbecameasolidball.,8.Waterappearedontheearth.,4.Smallplantsgrewonthewater.,9.Shellfishandotherfishappeared.,6.Plantsbegantogrowondryland.,1.Insectsandamphibiansappeared.,5.Reptilesappeared.,2.Dinosaursappeared.,12.Mammalsappeared.,11.Cleveranimalswithhandsandfeetappeared.,Letsreviewtheevolutionoflifeontheearth.,Afterthe“BigBang”,theearthwasfullofwater.,Originalcellsappearedintheocean.,Marineanimalscameintobeing.(shellfishandfish),Somelandanimals(amphibian&insects)wereabletoliveonland.,Reptileappeared.,dinosaurs,Mammals,Mammals,apes,Manhaddevelopedfromapes,Thedevelopmentoflifeontheearth,Wearemakingtheworldbetter.,Wearemakingtheworldworse.,A,B,Discussion,Humansdevelopednewmethodsofgrowingfood，buildinghouseandtransportation.,(1)Whathumansdeveloped?,Greenhouseeffect,(2)Buttheyarenottakingcareoftheearthverywell.Whatproblemarehumanscausing?,puttingcarbondioxideintotheatmosphere,theearthmaybecometoohot,Asastudent,whatlittlethingscanwedofortheearth?,Discussion,sol