Unit 4 Global Warming 教案1（人教版高中英语选修六)4页

Unit4Globalwarming.1.教材分析本单元以Globalwarming为主线，旨在通过单元教学使学生经过思考、学习，认识到全球变暖的起因和它所带来的种种后果。同时鼓励学生进一步阐述地球所面临的其它严重问题，激发学生的环保意识。引导学生运用所学语言、句式表达自己对这些现象的看法，培养他们为自己的观点辩论的能力，并能运用所学知识写一篇有关环境问题的论文。1.3Reading是一篇从杂志节选的文章。它讲述了全球加速变暖的原因——人为温室效应，后果以及人们对此的不同观点。要求学生在理解文章大意的同时注意它的写作技巧：提出问题——分析现象——阐述各方面的不同观点——以疑问句作为总结引发读者深思，自行做出判断。这为Comprehending中Exercise3的分组辩论活动留出了很大的空间，埋下了很好的伏笔。TheSecondPeriodReadingTeachinggoals教学目标1.Targetlanguage目标语言a.重点词汇和短语compare,phenomenon,graph,fuel,trap,data,climate,catastrophe,consequence,range,per,glance,compareto,comeabout,fiercedebate,resultin,buildupb.重点句式Thereisnodoubtthattheearthisbecomingwarmer.P26Withoutthe‘greenhouseeffect’,theearthwouldbeaboutthirty-threedegreesCelsiuscoolerthanitis.P26Theyalsoagreethatitistheburningofmoreandmorefossilfuelsthathasresultedinthisincreaseincarbondioxide.P262.Abilitygoals能力目标Enablethestudentstotalkaboutthecausesandeffectsofglobalwarming.3.Learningabilitygoals学能目标Helpthestudentslearnhowtotalkaboutthecausesandeffectsofglobalwarmingandexpressideasaboutwhatpeopleshoulddoaboutit.Teachingimportantpoints教学重点 Helpthestudentslearnhowtodebateoverthetopic“Weshoulddonothingaboutglobalwarming.”Teachingdifficultpoints教学难点Enablethestudentstolearnthewritingskillsofthetextandgetabetterunderstandingofarticlesofthiskind.Teachingmethods教学方法Listening,readingandgroupwork.Teachingaids教具准备Arecorderandacomputer.Teachingprocedures&ways教学过程与方式StepⅠRevisionCheckthehomework.Reviewtheusefulexpressionsaboutagreementanddisagreement.Showthestudentssomepicturesonthescreen.Thestudentshavetogivenamesofdifferentenergysourcesrelativetothepicturesanddeicidewhichenergysourcesarerenewableandwhicharenot.Thenaskthestudentstotelltheeffectsofusingtheseenergysources.StepⅡPre-readingShowapictureofgreenhouseonthescreen.T:Nowlookatthepicture.Whatisitinthepicture?S:Agreenhouse.T:Right.Whocantellmewhatitisusedfor?Sa:Agreenhouseismadeofglassandisusedforgrowingplants,especiallyduringcoldweather.T:Yes,youareright.Andhowdoesitwork?Sb:Theairinsideiswarmbecausetheglasstrapstheheatfromthesunandkeepsitfromescaping.Thismakesthegreenhouseheatupandsotheplantscangrowthroughoutthecoldperiod.T:Exactly.Thankyou.Buttodaywearenotgoingtotalkaboutgreenhouse,we’lltalkaboutgreenhousegases.Haveyouheardaboutthisbefore? Sc:Iknow.Intheatmospheresurroundingtheearththerearegases,whicharecalled“greenhousegases”,includingcarbondioxide,methaneandwatervapor.T:That’scorrect.Thenwhatdoyouthinkgreenhousegasesdo?Sd:Letmeexplainit.Theytrapheatfromthesunandthereforewarmtheearth.T:Yes.Lastclasswetalkedabouttheeffectsofburningfossilfuels.Oneoftheeffectsismoreandmorecarbondioxideisbeingproduced,whichinturnincreasesthespeedofglobalwarming.Doesitmatter?What’reyouropinions?Nextwe’llreadanarticle“THEEARTHISBECOMINGWARMER—BUTDOESITMATTER?”StepⅢWhile-readingGetthestudentstoreadthepassagefastandmeanwhilehelpthestudentsformagoodhabitofreading.T:Whatdoyouthinkwillbetalkedaboutatthesightofthetitle“THEEARTHISBECOMINGWARMER—BUTDOESITMATTER?”Nowpleaseskimthepassagetoobtainageneralideaofthewholepassage.Whilereading,payattentiontothewritingskillsandifpossible,dividethewholepassageintoseveralpartsandsummarizethemainideaforeachpart.Afterafewminutes.T:Howmanypartscanthistextbedividedinto?T:Anydifferentideas?OK.Nowlet’sfinishtheformonthescreen.Showtheformonthescreenandletthestudentscompletetheform.MainideasofeachpartWritingtechniquesStepⅣComprehendingLetthestudentsreadthepassageagaintofindouttheanswerstothequestionsinExercises1and2.T:Nowlet’slistentothetape.Whilelistening,paymoreattentiontospecific information.Thenreadthewholepassagebyyourselves.TrytofindouttheanswerstoquestionsinExercises1and2.Youmayworkingroups.StepⅤDebateGetthestudentstodebateoverthestatement:Weshoulddonothingaboutglobalwarming.Letthemworkingroupsofsixtoprepareit.T:Nowyouaregoingtohaveadebate:Weshoulddonothingaboutglobalwarming.Pleasefollowtheseinstructions.Putthefollowinginstructionsonthescreen.●Getintogroupsofsix.Decidewhichthreeinyourgrouparegoingtoagreewiththestatement(GroupA)andwhichthreearegoingtodisagreewiththestatement(GroupB).●GroupAdiscusswhytheyagreewiththestatement;GroupBdiscusswhytheydisagree.●GroupAandBgettogether.Telleachotherthereasonswhyagreeordisagreewiththestatement.T:Wedon’thavetimetodoitinclass.Pleasefinishitafterclass.TrytocollectasmuchinformationaspossibleontheInternetandshareitwiththeothersinclass.NextclassI’llgetsomegroupstoactoutyourdebates.StepⅥHomework1.Readthepassageagainandreviewthenewwordsandexpressions.2.Preparethedebateingroups.3.PreviewUsingLanguage―WHATCANWEDOABOUTGLOBALWARMING？