高中英语《Unit4 Astronomy the science of the stars》教案（2）新人教版必修3-新人教版高一必修3英语教案VIP免费

Period2Pre-reading,Reading&ComprehendingTeachingGoals:1.ToenableSstobetterunderstandthetheoryabouttheoriginoftheuniverseandlifeontheearth—the“bigband”theory.2.ToenableSstoconcernaboutthefutureoflifeontheearth.Step1.Pre-readingPurpose:ToarouseSs’interestinlearningaboutsomerelativeinformationabouttheuniverse.1.ShowsomepicturestotheclassandencourageSstosaysomeinformationabouthowlifebeganontheearth.Theycansaysomerelativelegends,folktalesorscientifictheoriesaboutthetopic.Thesolarsystemismadeupofthesunandtheobjectsthatorbitit.Theearth’satmosphereForreference:Someideasaboutthebeginningoftheuniverse:●PanGuturnsintoamyriadof(各种)things盘古化生万物●PanGuseparatestheskyfromtheearth盘古开天地●NuWamakesmen女娲造人ConclusionandLeading-in:Buttheseideasareallnotthecorrectandscientificideas.Doyouknowthescientificideaofthedevelopmentofthelifeontheearth?Thenwe’dbettercometothetext.Step2.FastreadingPurpose:Togetthegistofthepassage.Tocorrectlyunderstandsomeinformationgiveninthetext.1.AskSstoreadthetextquicklyandtrytogetthemainideaofthetext.SuggestedAnswer:Themainideaofthetextisthetitle—Howlifebeganontheearth.2.AskSstoworkinpairsanddiscussthequestionsofEx1onP27.Andthenletthemchecktheanswersinpairs.Step3.IntensivereadingPurpose:togetthestudentstolearnthedetailsofthetext.(1)Answerthequestions:•Whendidthe“BigBang”happen?•Whatformwastheearththe“BigBang”?•Whatmadeuptheearth’satmosphereaftertheearthexploded?•Howdidwatercomeintobeingontheearth?•Whatwasimportanttothedevelopmentoffish?•Whatmadepossibletheriseofmammalsontheearth?•Whyaremammalsdifferentfromalllifeformsinthepast?（2）Fillinthechartabouttheorderofdevelopmentoflife.SuggestedAnswers:④⑤③②①⑥⑦⑧⑨⑩①Smallplantsinwater②Shellfishandallsortsoffish③Greenplantsonland④Insects(onland)⑤Amphibians(onlandandinwater)⑥forests⑦reptiles(onland)⑧dinosaurs(onland)⑨mammals(onland)⑩humanbeings