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高中英语：Unit4 Astronomy the science of the stars课件（新人教必修3）.ppt

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WELCOMETOMYENGLISHWORLD!Step1LeadinUnit4Astronomy:thescienceofthestarsStep2WarmingupStep3AquizStep4Pre-readingPanguseparatestheskyfromtheearth.Nvwamakeshumanbeings.Godcreatedman.Whatisthepassageabout?While-readingMainideaofeachparagraphWhile-readingWhywastheearthdifferentfromotherplanets?AItproducedalotofheat.B.Thewaterremained.CWaterdisappeared.D.Itwastheoldestplanet.Whydidtheplantsgrowbeforeanimalscame?Step6LookingandthinkingAcloudofdustInsectsandamphibiansManhadevolvedfromapes.ThedevelopmentoflifeWehaveonlyoneearth!Whetherlifewillcontinueontheearthdependsonhumanbeings.Step8HomeworkgoodbyeWhatsubjectsdoyoulearnatschool?Task3:Carefulreading4.Whydidgreenplantshelplifetodevelop?Becausegreenplantscantakecarbondioxidefromtheatmosphereandfilltheairwithoxygen.5.Whyweremammalsdifferentfromotheranimals?Theyweredifferentbecausetheyproducedtheiryoungfromwithintheirbodies.6.Howdidwatercomeintobeingontheearth?Theexplosionoftheearthproducedwatervaporwhichturnedintowaterwhentheearthcooleddown.WaterAirLife________madeitpossibleforlifetobegintodevelop.Plantsencouragedthedevelopmentof_____________________________.Later_____________appeared.Whenplantsgrewintoforests______appearedforthefirsttime.Somehugeanimalscalled_________developed.Whendinosaursdisappeared_________becamemoreimportant.