Unit 2 Topic 2 Section C教案

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1、Unit2SavingtheEarthTopic2SectionC教案教学目标1.LearnsomeLearnsomenewwordsandphrases:onearth,period,millionsof,takeaway,rise,level,referto2.Learnsomeusefulsentences:(1)Theheadroomthesuncan’tescape(2)Whenitrainsorwhenthewindblows,theearthistakenaway.教学重、难点Learntotalkabou

2、ttheharmofpollution:(1)Forestshavebecomedeserts,somoreandmoresortsofanimalsandplantsaredisappearing.(2)Asaresult,manyriversandlakesarenowdead.(3)Toomuchharmfulradiationfromthesunpassesthroughtheholeandreachestheearthdirectly.(4)Itcausestheleveloftheoceanstorisean

3、dtheclimateoftheearthtochange.教学准备Taperecorderandsomepictures.教学过程Step1自学导纲通过检查作业，引导学生开拓思维，提出保护环境和水资源的具体措施，复习不定代词和副词。为学习新词汇作准备。T:Howdoyouprotectourenvironmentandsavewater?S1:Everyoneshouldplantmoretrees.S2:Weshoulddoeverythingwecantosavewater.S3:Everybodyshouldkn

4、owtheimportanceofforests.S4:Passlawsagainstwaterpollution.S5:Collectandreusewastewater.…Step2合作互动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,Beijingoftenhassandstormsinspring.Whatcausesthebadweather?Ss:Cuttingdowntoomanytrees.(展示1a第二幅图

5、画。)T:Yes.Allovertheworld,peoplehavecutdownmillionsoftrees.Andtreesbecomefewerandfewer.T:Cuttingdowntoomanytreescausesthebadweather.Howcantreesaffecttheweather?S1:Theycankeepwaterfromrunningaway.S2:Theycanstop…S3:…T:Yes.Treescanstopthewindandwaterfromtakingtheeart

6、haway.T:Anythingelse?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.Treescanbreatheincarbondioxideandbreatheoutoxygen.T:WheredoesCO2comefrom?S4:Animals’breathing.S5:Burningoil.Forexample,carsandbuses.T:Yes.Theyhavepollutedtheair.Carbondioxideintheairhasincreasedalot.

7、Thishasformeda“blanket”aroundtheearth.T:Theheatfromthesuncan’tescape,sothetemperatureisrising.T:Thisiscalled“thegreenhouseeffect”.T:Becauseofthegreenhouseeffect,whathappenstotheicebergs(冰川)?Ss:Somepartsofthemchangeintowater.T:Soitcausestheleveloftheoceanstorise.T

8、:(展示1a第4幅图。)Pleaselookatthispicture.Aroundtheearth,there’saspecialkindofoxygencalled“ozone”.T:Butnowairpollutionisdestroyingitandthathasmadeaverybigholeintheoz