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Book3Unit4Astronomyascienceofthestars.docx

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Book3Unit4Astronomy:ascienceofthestars HOWLIFEBEGANONTHEEARTH 广州执信中学:邓丽 Objectives (1)Tounderstandthepassageabouthowlifebeganontheearth. (2)Tobeabletogiveabriefintroductionoftheevolutionoflifeontheearth. (3)Tobeinterestedintheexplorationofthescience. Teachingofthelesson StepI.Pre-reading: (1)Whatmakestheearthspecialamongsolarsystem? (2)Whyistherelifeontheearth?(TrueorFalsestatements) Conclude3fundamentalconditions： StepII.While-reading (1)Prediction：Analyzethefeaturesofthepassage. 1.Whattypeofpassageisthisone? 2.Whatisthefeatureofanexposition?(2points) (2)Introducethewidelyacceptedtheoryabouthowlifebeganontheearth——TheBigBangtheory. (3)GroupWork Paragraph1Mainidea:Theoftheuniverse. Paragraph2Mainidea:Theoftheearth. Howdidtheearthcomeintobeing? Paragraph3Mainidea:Theofwaterforlife. Chainreaction: Paragraph4Mainidea:Theofplantsandanimals lives O X Y G E N Paragraph5Mainidea:Theofhumansandtheirontheearth. Putfartoomuch______________intothe___________. Whatproblemiscausedbyhumanbeings? ________heat______escapingfromtheearth _____________ （全球变暖） _________effect (温室效应) StepIV.Post-reading Discussion: Whatcanwedotoprotecttheearth? StepV.Homework (1)Finishyourhandout. (2)Rereadthepassageandthenewwords. (3)Findsomeusefulexpressionsinreading.