新课标人教版高中英语必修3Unit 4 AstronomyReading课件.ppt

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1、Unit4Astronomy:thescienceofthestarsReadingReadparagraph1,andanswerthefollowingquestions.1.Howdidwatercomeintobeingontheearth?2.Whatisthesignificanceofthepresenceofwaterontheearth?Theexplosionoftheearthproducedwatervapour,whichturnedintowaterwhentheearthcooleddown.Itallowedtheearthtodissolv

2、eharmfulgasesintooceansandseas.Reading-II----skimming(3m)自主学习Puttheorderofdevelopmentoflifeintoatimeline.insectsandamphibiansappearasolidballreptilesappearacloudofdustshellfishandotherfishappeardinosaursappearsmallplantsgrowonthewaterplantsbegintogrowondrylandpresenceofwatermammals(includi

3、nghumans)appearDBIGEHACFJ反馈练习Stage1:Thedevelopmentoftheearth(1)AftertheBigBang,whatwastheearthlike?acloudofdustasolidglobe合作探究explodedwithfireandrockproducedwatervapourandgases(2)Whathappenednext?合作探究Waterappeared(4)Whatappearedastheearthcooleddown?waterisimportantforthebeginningoflifeonth

4、eearth.合作探究Whyiswatersoimportantforthebeginningoflife?Becausewaterallowedtheearthtodissolveharmfulgasesandacidsintooceansandseas.？合作探究Stage2Thedevelopmentoflifesmallplantsappearsinwater1.Whatlifedevelopedafterwaterappeared?自主学习Shellfishandallsortsoffish2.Whatlifedevelopedinwaternext?自主学习gr

5、eenplantsbegantogrowonlandinsectsappeared3.Whataboutthelifeonland?自主学习amphibiansonlandandinthewaterforests4.Whatlifedevelopednextonland?自主学习reptilesappeareddinosaurdeveloped5.Whatlifedevelopedafterforestsappeared?自主学习mammalsonland6.Whatlifedevelopedafterdinosaurs?自主学习smallcleveranimals7.Wh

6、atlifedevelopedaftermammals?自主学习Whataretheydoingontheearth?合作探究Becausetheyareputtingtoomuchcarbondioxideintotheatmosphere,whichpreventsheatfromescapingfromtheearthintospace.Theearthmaybecometoohottoliveon.1.Insectsandamphibiansappeared.3.Theearthbecameasolidball.5.Reptilesappeared.7.Theear

7、thwasacloudofdust9.Shellfishandotherfishappeared.11.Cleveranimalswithhandsandfeetappeared2.Dinosaursappeared.4.Smallplantsgrewonthewater.6.Plantsbegantogrowondryland.8.Waterappearedontheearth10.Theuniversebeganwitha“BigBand”.12.Mammalsappeared.831091151741262C