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Unit4Astronomy:thescienceofthestarsReadingHowlifebeganontheearth大城县职教中心常云英TeachingAims:1.Trainthestudents’readingability.2.Makestudentslearnandmastertheusefulwords,phrasesandsentencestructures.3.Learntheoriginoflifeontheearthandstimulatestudents’interestinastronomy.TeachingImportantPoints:1.Improvethestudents’readingability.2.Mastertheusefulwords,phrasesandsentencestructures.TeachingDifficultPoints:1.Howtohelpthestudentsimprovetheirreadingabilityandunderstandthepassagebetter.2.Howtomasterthelanguagepointsinthepassage.TeachingMethods:1.Fastreadingtogetthegeneralideaofthetext.2.Carefulreadinganddiscussiontohelpthestudentsunderstandthepassagebetter.3.Explanationtohelpthestudentsmastersomelanguagepoints.TeachingAids:Themultimediaandothernormalteachingtools.TeachingProcedures:Step1Greetingsandrevision.Greetthewholeclassasusualandcheckthehomeworkexercises.Step2Lead-inToarousestudents’interestinastronomy，introducesomestoriesthattellhowtheuniversebeganwiththehelpofpictures.Theexamplesofthesestoriesare:ThestoryofPangu,andNvwa’smendingthesky.Step3WarmingupandPre-readingAskstudentstolookatthescreenandfilloutthechartabouttheuniverse.Thenaskthestudentsthequestion:Whatarenamesoftheeightplanetsthatcircleoursun?AskthestudentstolookatthepictureintheirbooksandnamethemfirstinChineseandthenfindtheEnglishnamesintheboxandmatchthem.Tomakesurethatstudentsknowthenamesandcorrectpositionsoftheplanets,showthemthepictureabouttheeightplanetsonthescreen.Afterthat,showthestudentsmorepicturesonthescreenandaskthem:Theearthisthehometothelivingthings.Doyouknowhowlifebeganontheearth?Askthestudentsinpairstodiscusshowtheythinklifebeganonearth.Thenaskthemtocomparetheirideaswithanotherpairandbepreparedtogivetheirbestideastotheclass.Ifthestudentsdonotknowverymuch,stimulatetheirmemorybyaskingthemsomequestionsaboutthescientificexplanation:1.Howoldistheuniverse?(severalbillionyearsago)2.Howoldistheearth?(between4.5and3.8millionyearsago)3.Whichwerethefirstcreaturesorplantsonearth?(verysmallair-breathingcreatures)4.Doyouknowwhattheorderforthedevelopmentofplantsandanimalsis?(seereading)5.Doyouknowwhyhumanbeingsaremoreintelligentthanotheranimals?(talk)Step4ReadingIFastreading:Askthestudentstoreadthetextquicklyandthenchoosethecorrectanswerstotheexercisesonthescreen.Thenchecktheanswerstogether.1.Whywasitnecessaryforplantstogrowbeforeanimalsappeared?A.Becauseplantsprovidedoxygenforanimalstobreathe.B.Animalsneededplantstoprotectthemfromthesun.C.Itwaseasierforplantstogrow.2.Whydidlifedevelopontheearthbutnotonotherplanets?A.Theearthhadasolidshape.B.Thewaterexistedontheearthbutnotonotherplanets.C.Theearthwasnottoohotortoocoldforhumanstoliveon.3.Wecaninferfromthelastparagraphthat____.A.humanbeingsarethelastanimalsthatappearedontheearthB.scientistsfindoutsomewaystodealwithglobalwarmingC.animalscan’tliveontheearthifitbecomestoohotIICarefulreadingAskthestudentstoreadthetextcarefullyandthenlookatthescreentofillinthechartabouttheoriginoflifeonearth.IIIDiscussionandtalkTheteachercanaskthestudentstoworkingroupsanddiscussthequestionsonthescreen:1.Whyisitwrongtoshowfilmswithdinosaursandpeopletogether?2.Whatproblemiscausedbyhumanbeings?Possibleanswers:1.Becausedinosaursdiedoutlongbeforehumanbeingsdevelopedontheearth.2.Humanbeingscausedglobalwarming.greenplantsonlandInsects(onland)Amphibians(onlandandinwaterforestssmallcleveranimalswithHandsandfeetreptiles(onland)dinosaurs(onland)mammals(onland)watershellfishandallsortsoffishStep5HomeworkFinishofftheWorkbookexercises1,2教学流程复习展示图片,介绍有关宇宙的背景知识及其构成.看图了解太阳系中的八大行星及英文名称展示地球上一些生物图片引出地球上生命的起源.理解课文快速阅读理解大意回答问题仔细阅读课文完成地球上生命进化图播放课文录音找出课文重点词句进行分析、总结课堂小结布置作业结束开始