人教新课标必修三+Unit+4+Astronomy-Reading[课件].ppt

Unit4Astronomy:thescienceofthestars,Reading,Readparagraph1,andanswerthefollowingquestions.1.Howdidwatercomeintobeingontheearth?2.Whatisthesignificanceofthepresenceofwaterontheearth?,Theexplosionoftheearthproducedwatervapour,whichturnedintowaterwhentheearthcooleddown.,Itallowedtheearthtodissolveharmfulgasesintooceansandseas.,Reading-II-skimming(3m),自主学习,Puttheorderofdevelopmentoflifeintoatimeline.insectsandamphibiansappearasolidballreptilesappearacloudofdustshellfishandotherfishappeardinosaursappearsmallplantsgrowonthewaterplantsbegintogrowondrylandpresenceofwatermammals(includinghumans)appear,D,B,I,G,E,H,A,C,F,J,反馈练习,Stage1:Thedevelopmentoftheearth,(1)AftertheBigBang,whatwastheearthlike?,acloudofdust,asolidglobe,合作探究,explodedwithfireandrock,producedwatervapourandgases,(2)Whathappenednext?,合作探究,Waterappeared,(4)Whatappearedastheearthcooleddown?,waterisimportantforthebeginningoflifeontheearth.,合作探究,Whyiswatersoimportantforthebeginningoflife?Becausewaterallowedtheearthtodissolveharmfulgasesandacidsintooceansandseas.,？,合作探究,Stage2Thedevelopmentoflife,smallplantsappearsinwater,1.Whatlifedevelopedafterwaterappeared?,自主学习,Shellfishandallsortsoffish,2.Whatlifedevelopedinwaternext?,自主学习,greenplantsbegantogrowonland,insectsappeared,3.Whataboutthelifeonland?,自主学习,amphibiansonlandandinthewater,forests,4.Whatlifedevelopednextonland?,自主学习,reptilesappeared,dinosaurdeveloped,5.Whatlifedevelopedafterforestsappeared?,自主学习,mammalsonland,6.Whatlifedevelopedafterdinosaurs?,自主学习,smallcleveranimals,7.Whatlifedevelopedaftermammals?,自主学习,Whataretheydoingontheearth?,合作探究,Becausetheyareputtingtoomuchcarbondioxideintotheatmosphere,whichpreventsheatfromescapingfromtheearthintospace.,Theearthmaybecometoohottoliveon.,1.Insectsandamphibiansappeared.3.Theearthbecameasolidball.5.Reptilesappeared.7.Theearthwasacloudofdust9.Shellfishandotherfishappeared.11.Cleveranimalswithhandsandfeetappeared,2.Dinosaursappeared.4.Smallplantsgrewonthewater.6.Plantsbegantogrowondryland.8.Waterappearedontheearth10.Theuniversebeganwitha“BigBand”.12.Mammalsappeared.,8,3,10,9,11,5,1,7,4,12,6,2,Canyouputtheorderofdevelopmentoflifeintoatimeline?直击高考,Ex.2onP27,7.Concludethemainideaofeachparagraph.1)Awidely_aboutthe_oftheuniverse.2)Theformationofthe_.3)The_ofwaterforlife.4)Thedevelopmentof_and_ontheearth.5)Thearrivalof_andtheir_ontheearth.Thetextmainlytellsusthe_oftheearthandthe_oflifeonit.,8.ThemainideaofReading1.,Ex.1onP27,theory,origin,earth,importance,plants,animals,humans,influence/effect,formation,development,直击高考,Howlifebeganonearthisoneofthebiggestpuzzlesthatscientistsfoundhardtosolve.Whatotherpuzzlesarehiddeninthepassage?,Discussion,Ex.5onP27,Howdoestheuniverse(earth)form?Whydidtheearthcooldown?Whydidwaterdisappear