九年级英语上册 unit 2《topic 2 all these problems are very serious》section c 教学设计 仁爱版

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1、九年级英语上册Unit2《Topic2Alltheseproblemsareveryserious》SectionC教学设计仁爱版Themainactivityis1a.本课重点活动是1a。Step2Presentation第二步呈现(时间:18分钟)教师通过日常对话，借助1a中的图片，创设情景，导入新课，呈现新的词汇。1.(教师由日常对话，引出本课话题，呈现部分新词汇。)T:What’stheweatherliketoday?Ss:It’s…T:Asweknow,Beijingoftenhassandstormsinsprin

2、g.Whatcausesthebadweather?Ss:Cuttingdowntoomanytrees.(展示1a第二幅图画。)T:Yes.Allovertheworld,peoplehavecutdownmillionsoftrees.Andtreesbecomefewer.(板书并要求学生掌握。)millionsofT:Cuttingdowntoomanytreescausesthebadweather.Howcantreesaffecttheweather?S1:Theycankeepwaterfromrunningaw

3、ay.S2:Theycanstop…S3:…T:Yes.Treescanstopthewindandwaterfromtakingtheearthaway.(板书并要求学生掌握。)takeaway2.(继续探讨上述问题，引出新词汇。)T:Anythingelse?(如果没有学生回答，继续如下问题。)T:What’stheairlikeintheforest?Ss:It’sfresh.T:Yes.Why?Ss:(允许学生用汉语回答。)树能吸收二氧化碳并释放氧气。T:That’sright.Treescanbreatheincarb

4、ondioxideandbreatheoutoxygen.(展示1a第五幅图。)Pleaselookatthepicture.(板书并要求学生理解。)carbondioxide:CO2oxygen:O2T:WheredoesCO2comefrom?S4:Animals’breathing.S5:Burningoil.Forexample,carsandbuses.T:Yes.Theyhavepollutedtheair.Carbondioxideintheairhasincreasedalot.Thishasformeda“bl

5、anket”aroundtheearth.(板书并要求学生理解。)blanketT:Theheatfromthesuncan’tescape,sothetemperatureisrising.(板书并要求学生掌握rise；理解escape。)escaperiseT:Thisiscalled“thegreenhouseeffect”.(板书并要求学生理解。)thegreenhouseeffectT:Whathappenstotheicebergs(冰川)?Ss:Somepartsofthemchangeintowater.T:So

6、itcausestheleveloftheoceanstorise.(板书并要求学生掌握。)levelT:(展示1a第4幅图。)Pleaselookatthispicture.Aroundtheearth,there’saspecialkindofoxygencalled“ozone”.(板书并要求学生理解。)ozone:O3T:Butnowairpollutionisdestroyingitandthathasmadeaverybigholeintheozonelayer.(板书并要求学生理解。)ozonelayerT:Too

7、muchharmfulradiationfromthesunpassesthroughtheholeandreachestheearth.(板书并要求学生理解。)radiation3.(让学生快速阅读1a，用所给的词组填空。完成1a。)T:Wehumanshavelivedonearthforonly35000years,butduringthisperiodwehavechangedourplanetalotinmanyways.Nowreadthepassageandthenchooseapropertitleforeach

8、paragraphfromthephrasesabovethepassage.(板书并要求学生掌握。)onearth,period(学生完成后与教师核对答案。)4.(教师出示小黑板上的问题，让学生再读一遍课文后回答。)(1)Havewechangedourpla