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

Unit4Astronomy:thescienceofthestarsReadparagraph1andanswerthefollowingquestions.1.Howdidwatercomeintobeingontheearth?2.Whatisthesignificanceofthepresenceofwaterontheearth?Stage1:ThedevelopmentoftheearthexplodedwithfireandrockWaterappearedWhyiswatersoimportantforthebeginningoflife?Becausewaterallowedtheearthtodissolveharmfulgasesandacidsintooceansandseas.Stage2ThedevelopmentoflifesmallplantsappearsinwaterShellfishandallsortsoffishgreenplantsbegantogrowonlandamphibiansonlandandinthewaterreptilesappearedmammalsonlandsmallcleveranimalsWhataretheydoingontheearth?Becausetheyareputtingtoomuchcarbondioxideintotheatmospherewhichpreventsheatfromescapingfromtheearthintospace.1.Insectsandamphibiansappeared.3.Theearthbecameasolidball.5.Reptilesappeared.7.Theearthwasacloudofdust9.Shellfishandotherfishappeared.11.Cleveranimalswithhandsandfeetappeared7.Concludethemainideaofeachparagraph.1)Awidely______aboutthe_____oftheuniverse.2)Theformationofthe______.3)The__________ofwaterforlife.4)Thedevelopmentof______and_______ontheearth.5)Thearrivalof_______andtheir_____ontheearth.Thetextmainlytellsusthe_________oftheearthandthe___________oflifeonit.Howlifebeganonearthisoneofthebiggestpuzzlesthatscientistsfoundhardtosolve.Whatotherpuzzlesarehiddeninthepassage?1.Finishtheexercise1and2onpage632.Readthetextagainandfindoutyourdifficultpoints.