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1、Unit10Air【第三课时】【教学目标】1．通过Askandanswer的问答练习帮助学生运用核心句型，联系实际，围绕空气污染展开讨论。2．通过Thinkandwrite的写作练习，帮助学生综合运用本单元所学的句型描述空气的重要性和空气污染的原因，并对如何保持空气洁净给出建议。3．帮助学生学习字母g,j,s和字母组合ch,sh在单词中的发音。4．通过学习任务，帮助学生巩固和运用本单元所学的知识和技能。【教学重难点】1．语音：ch,g,j,sh,s2．句型：Whatmakestheairdirty?【教学准备】课件
2、、音频【教学过程】I.Pre-taskpreparations1．学生表演Sayandact的对话，引入本课时的学习内容。T:Fromthedialogueweknowthatsmokemakestheairdirty.Todaywearegoingtalkaboutitmore.2．教师设问，让学生根据自己的认知说说空气污染的情况II.While-taskprocedures1．借助多媒体或挂图出示空气污染的图片，让学生说说空气污染的原因。T:Lookatthesephotos.Canyoutellmewhatm
3、akestheairdirty?S1:Thesmokefromfactoriesmakestheairdirty.S2:Thesmokefromcarsmakestheairdirty.S3:Thesmokefrombusesmakestheairdirty.S4:Thesmokefromburningwoodmakestheairdirty.3/3S5:Thesmokefromfirecrackersmakestheairdirty.2．根据学生的回答引出下一个问题，并出示Askandanswer栏目中第二排的图
4、片，激发学生思考保护环境的对策。T:There'ssomuchairpollutionnowadays.Whatshouldwedotokeeptheairclean?S1:Weshoulddriveourcarslessoften.S2:Weshouldn'tplaywithfirecrackersalot.S3:Weshouldrideabicycleortakebusestoworkorschoolmoreoften.S4:Weshouldusebothsidesofthepaper.S5:Weshouldt
5、ellfactoriesnottopollutetheair.（学生可以先在小组内讨论，然后在班级内进行交流。）3．教师总结本单元的内容，用问题帮助学生梳理学习内容。T:Inthisunit,whatdidwetalkabout?Ss:Air.T:Whatisairlike?S1:Airhasnocolor,shape,smellortaste.S2:Airisimportanttous.S3:Airkeepspeople,animalsandplantsalive.T:Whatmakestheairdirty?S
6、1:Smokefromfactories,carsandbusesmakestheairdirty.T:Whatshouldwedotokeeptheairclean?S1:Weshoulddriveourcarsless.S2:Weshouldplantmoretrees.4．将以上三个引导性问题的核心内容板书在黑板上，帮助学生总结本单元的学习内容。T:Inthisunit,welearntaboutair.Pleasetellussomethingaboutair.S2:Airhasnocolororshape
7、.Wecan'tseeit,butwecanfeelit.Airisimportanttous.Airkeepsusalive.Airkeepsthingshighinthesky.Nowtheairisgettingdirty.Thesmokefromfactoriesmakestheairdirty.Thesmokefromcarsandbusesmakestheairdirtytoo.It'snotgoodforus.Weshouldkeeptheairclean.Weshoulddriveourcarsle
8、ssoften.Weshouldplantmoretrees.Wehopewecanhavefreshairallthetime.5．最后，让学生通过小组和集体交流，谈一谈个人对空气的认识。6．学生朗读Learnthe3/3sounds的单词，感受红色字母的发音。教师可以先作示范，引导学生自己找出发音规律。T:ch/tʃ/,chair,China.Ss:ch
