Unit2SavingtheEarthTopic2AlltheseproblemsareveryseriousSectionCⅠ.Materialanalysis本课是第二单元第二话题的第三课时，主活动是1a和3。通过阅读1a，进一步学习各种污染对地球造成的危害和造成这些污染的原因，培养学生通过图片预测文章大意的能力，其中出现了很多关于环境的专业术语，需要学生了解。1b是训练学生运用不同的阅读策略完成不同的任务，如：通过观察1a中的图片匹配相应的标题，再阅读文章，给每段话选择标题；另外，继续训练学生通过语境，找出单词指代的内容；最后在理解课文的前提下，归纳文章的大意。1c培养学生通过精读文章，学会用简单的词句做笔记，再通过1c表格中的内容简要复述文章大意。2是培养学生的资源策略。要求学生合理地运用网络资源查找与环境危害相关的信息，然后进行小组讨论，并要求学生做好笔记，为任务3做准备。3要求学生运用这些信息，在1c和2的基础之上进行写作练习，教师应强调衔接词在作文中的重要性。由于课堂上不方便完成2，因此，可将2和3安排为课后作业。通过读写的结合训练，引导学生关注全球环境的现状，意识到环境保护的重要性，树立正确的环保观念。Ⅱ.Teachingaims1.Knowledgeaims：掌握本课的重点词汇和短语，初步感知定语从句。进一步学习各种污染对地球造成的危害和造成这些污染的原因。2.Skillaims:
能读懂有关环境问题的文章。能根据不同的阅读目的，运用简单的阅读策略获取信息。能正确运用网络资源获取需要的信息。能用英语书面的形式表达环境问题的成因及危害。3.Emotionalaims:(optional)通过学习，了解环境现状，帮助学生树立绿色环保意识。4.Cultureawareness:(optional)了解各种环境问题，如臭氧空洞，温室效应等，意识到环境问题的严峻形势。Ⅲ.Thekeypointsanddifficultpoints1.Keypoints:Wordsandphrases:hole,form,rise,oxygen,ozonelayer,radiation,directly,carbondioxide,blanket,escape,thegreenhouseeffect,referduringthisperiod,takeaway,passthroughSentences:(1)Forestshavebecomedeserts,somoreandmoresortsofanimalsandplantsaredisappearing.(2)Asaresult,manyriversandlakesarenowdead.(3)Toomuchharmfulradiationfromthesunpassesthroughtheholeandreachestheearthdirectly.(4)Itcausestheleveloftheoceanstoriseandtheclimateoftheearthtochange.(5)Whenitrainsorwhenthewindblows,theearthistakenaway.(6)Theheatfromthesuncan’tescape,sothetemperatureisrising.
Grammar:indefinitepronounandadverb2.Difficultpoints：理解有关环境方面的专业术语。能读懂与环境问题相关的科普类文章。能运用所学知识，写出谈论环境现状的文章。Ⅳ.Learningstrategies能在阅读不同体裁的材料时，运用不同的阅读策略获取信息。善于利用插图预测科普类文章的内容。能合理运用网络资源，拓展写作思路和开拓视野。恰当使用连接词，使自己的作文流畅，有逻辑层次。Ⅴ.Teachingaids与环境相关的图片；单词卡片（如O2/oxygen;ozonelayer;radiation等）；录音机；国际臭氧层保护日宣传动画片等。
Ⅵ.TeachingproceduresStage(timeperiod)InteractionpatternsTeacheractivityStudentactivityRemarks1Gettingstudentsreadyforlearningandrevision（2mins）ClassactivityChecktheSs’homework:LettheSsgiveareportabouttheirownbadhabitsandhowtomakethecampusbetter.T:Hi,everyone.Lastclass,wehavetalkedsomethingabouttheschoolenvironment.Someofusmayhavesomebadhabits,andthesehabitscanaffectourcampus.Whatcanyoudotomakeourcampuslookbetter?Pleaseshareyouropinionswithus.S1:IoftenforgettoturnoffthelightswhenIleavetheclassroom.Ithinkitdoesn’tmatterifthelightsareonforalittlewhile.AndIoftenwastesomepaperafterIonlyuseasmallpartofit.IliketousenewGiveareportaboutyourownbadhabitsandhowtomakethecampuslookbetter.S1:IoftenforgettoturnoffthelightswhenIleavetheclassroom.Ithinkitdoesn’tmatterifthelightsareonforalittlewhile.AndIoftenwastesomepaperafterIuseonlya用报告的形式让学生在课堂上反思自己平时的言行，有助于学生更好提升自己，培养“爱护环境从我做起，从小事做起”的意识。
paper.ButnowIrealizethesehabitsarereallybadones,soIhopeeveryoneofuscansaveenergyfromnowon.T:Verygood.Ifyoucangivemoresuggestions,itwillbebetter.Nextone.S2:Ialwaysmakeloudnoisebetweenclasses.Itdisturbsothers.Ioftenthrowrubbisharoundinacornerifthereisnobody.Butfromnowon,Iwillremembertogetridofthebadhabits.Ifeveryonecanfollowtheschoolrules,ourcampuswillbecomemorebeautiful.S3:…T:Great.smallpartofit.Iliketousenewpaper.Ihopeeveryoneofuscansaveenergyfromnowon.S2:Ialwaysmakeloudnoisebetweenclasses.Itdisturbsothers.Ioftenthrowrubbisharoundinacornerifthereisnobody.Butfromnowon,Iwillremembertogetridofthebadhabits.Ifeveryonecanfollowtheschoolrules,ourcampuswillbecomemorebeautiful.S3:…2Lead-in(3mins)ClassactivityPlaythecartoonvideoaboutprotectingtheozonelayer.LettheSswatchanddiscussWatchthevideoanddiscusswhattheyhavelearntfromit.Takesome通过播放视频，让学生了解每年的9月16
whattheyhavelearntfromit.Takesomenotesifnecessary.T:Hereisavideoaboutprotectingtheozonelayer.Let’swatchitcarefully.ThenIwillaskyousomethingaboutit....T:NowLet’sfigureoutsomethingaboutozonelayer.Isozonelayerimportantorunimportant?Ss:It’sveryimportantT:Cantheozonelayerprotectus?Ss:Yes.T:Whathappenedtoitnow?Ss:Thereisabigholeintheozonelayer.T:Yes.What’stheeffectofit?Ss:It’sharmfultoallthelivingthings,especiallytohumansforitdoesharmtoournotes.Ss:It’sveryimportantSs:Yes.Ss:Thereisabigholeintheozonelayer.Ss:It’sharmfultoallthelivingthings,especiallytohumansforit日是国际臭氧层保护日，关注臭氧层的现状。该宣传片是卡通版，不是枯燥的科教片，能够很好地吸引学生的注意力。如果条件不允许，教师可以从课外书籍上选读一些与环境相关的文章。
eyesandskin.doesharmtooureyesandskin.…3Pre-reading(5mins)ClassactivityClassactivityStep1:Showtwopicturesofozonelayerandmorecarbondioxide.IntroducethemtotheSsbrieflytoteachthenewwords.T:Right.Ozoneisaspecialkindofoxygen.Itcanprotecttheearth.Nowpeopleproducelotsofharmfulchemicalsintotheair.Theycauseabigholeintheozonelayer.Sotheradiationcanpassthroughtheholeandreachtheearthdirectly.…(ShowthepictureofmorecarbondioxideandleadtheSstolearnthenewwordsinthesameway.)Step2:GuidetheSstopredictthemainideaofthepassagebythegivenpictures.Lookatthepicturesandlearnthenewwordsaccordingtoteacher’sdescriptions.Predictthemainideaofthepassagebythegivenpictures.在观看宣传片后，再介绍有关臭氧层和温室效应的英文词汇，学生容易理解，也容易掌握。
T:NowlookatthepicturesonPage39,canyouguesswhatwewilllearninthepassage.S1:Somethingaboutpollution.S2:Trafficpollution/airpollutionS3:OzonelayerS4:CuttingdowntreesS5:Carbondioxide…S1:Somethingaboutpollution.S2:TrafficpollutionS3:OzonelayerS4:CuttingdowntreesS5:Carbondioxide…培养学生通过观察图片，预测课文内容的能力，这有助于学生在日常阅读中，快速获取信息。4While-reading(20mins)IndividualworkStep1:LettheSsmatchthepictureswiththetitlesin1of1b,andthenreadparagraphs2-6quicklyandwritedownthepropertitleinfrontofeachparagraph.T:Excellent.Nowread1aquickly,matchthepictureswiththetitlesinExercise1quickly.S1:Picture1istrafficpollution.S2:Picture2istheozonelayer.Matchthepictureswiththetitlesin1of1b,andthenreadparagraphs2-6quicklyandwritedownthetitleinfrontofeachparagraph.S1:Picture1istrafficpollution..S2:Picture2istheozonelayer.教师在安排1b的阅读任务时，要注意以下两点：1.引导学生用不同的阅读策略完成不同的阅读任务。2.任务的安排要有层次性，从易到难。
IndividualworkS3:Picture3isfewertrees.S4:Picture4ismorecarbondioxide.S5:Picture5isfactorypollution.…T:Right.Nowpleasereadparagraphs2-6quickly,chooseatitleforeachparaandwritedowninfrontofit.…T:OK,let’schecktheanswertogether.S6:Para2isfewertrees.S7:Para3istrafficpollution.S8:Para4isfactorypollution.S9:Para5istheozonelayer.S10:Para6ismorecarbondioxide.Step2:LeadtheSstoreadparagraph1,5and6,findthewordsinExercise2,3and4S3:Picture3isfewertrees.S4:Picture4ismorecarbondioxide.S5:Picture5isfactorypollution.…S6:Para2isfewertrees.S7:Para3istrafficpollution.S8:Para4isfactorypollution.S9:Para5istheozonelayer.S10:Para6ismorecarbondioxide.Readparagraph1,5and6,findthewordsinExercise2,3and4and
Groupworkandguessthemeaningsofthemaccordingtothecontent.T:Great.Nowreadparagraph1,5and6,findthewordsinExercise2,3and4andguessthemeaningsofthemaccordingtothecontent.…T:Whatdoes“ourplanet”meaninthispara?S1:Itmeans“theearth”.T:Whatdoestheword“blanket”referto?S2:Carbondioxidearoundtheearth.T:Whatdoestheword“it”inPara5referto?S3:Itrefersto“O3”.…Step3:LettheSsread1acarefully,chooseguessthemeaningsofthemaccordingtothecontent.S1:Itmeans“theearth”.S2:Carbondioxidearoundtheearth.S3:Itrefersto“O3”.…Read1acarefully,choosethebest训练学生通过上下文猜测单词指代的内容，有助于学生更好的理解课文。该环节的三个小任务是用相同的方法获得信息，因此，可以一次性完成。
thebesttitleforthepassageandfinish5in1b.Thencompletethenotesin1caccordingto1a.T:Pleasereadthepassageandchoosethebesttitleforthepassage.…T:OK.Haveyougotthemainideaofthepassage?S4:Yes.Environmentalproblems.T:Right.Trytofinishthenotesin1caccordingtothepassage.Payattentiontousethekeywordswhentakingnotes.Youcandiscusswithyourgroupmembers.…T:OK.Haveyoufinished?What’stheeffectoftrafficpollution?S5:Peoplehavehealthproblem.titleforthepassageandfinish5in1b.Thencompletethenotesin1caccordingto1a.S4:Yes.Environmentalproblems.S5:Peoplehavehealthproblem.归纳文章中心思想，是学生较为头疼的题目，因此，如果文章较长的话，最好把它放到最后一个环节处理，降低难度，教师要引导学生用排除法作出正确的选择。
T:What’stheeffectoffactorypollution?S6:Factoriesmaketheriverandlakesdead.S7:……T:That’sright.Youdidverywell.S6:Factoriesmaketheriverandlakesdead.…5Post-reading(12mins)Individualwork,GroupworkandclassactivityStep1:LettheSsread1acarefully,findoutthedifficultpoints,andlistthemontheBb.T:Read1aagainandfindoutthedifficultpoints.PleasecollectthemingroupsandlistthemonyoursmallBb.…T:OK,nowlookatthepointsofGroupOneontheBb.Lookatthisone“Whatdoestheword“others”referto?”Whocandealwithit?S1:Somethingwehavedone.Read1acarefully,findoutthedifficultpoints,andlisttheminthesmallBb.S1:Somethingwehavedone.本环节具体操作说明：1.学生在组内归纳好本组存在的问题。2.教师任意选择一组作为主讲，在讲解过程中，仍然遵循先让学生解答、教师补充的原则。3.再补充讲解其他组剩下的问题，相同的问题不作重复讲解。
PairworkT:OK,lookatthissentence“theearthistakenaway”.Whocantranslateit?S2:Itmeans“泥土被带走了”inChinese.…Step2:GuidetheSstoretellthepassageaccordingtothefirstpara,lastparaandthenotesin1c.T:Nowworkinpairs.Trytoretellthepassageaccordingtothefirstpara,lastparaandthenotesin1c.…T:Nowwhocanhaveatry?S1:Sincehumanslivedontheearth,wechangedtheearthalot.SomethingisgoodS2:Itmeans“泥土被带走了”inChinese.(TheSsneedtotakenoteswhiletheteacherisgivingsomeexplanations.)Workinpairs,trytoretellthepassageaccordingtothefirstpara,lastparaandthenotesin1c.S1:Sincehumanslivedontheearth,wechangedtheearthalot.4.最后老师将重点板书到黑板上。
whilesomethingisbad.Therearefewertreesintheworld.Peoplecutdownthem,soforestsbecomedesertsandanimalsandplantsaredisappearing…S2……Somethingisgoodwhilesomethingisbad.Therearefewertreesintheworld.Peoplecutthemdown,soforestsbecomedesertsandanimalsandplantsaredisappearing…S2……6Summarizingandassigninghomework(3mins)ClassactivityStep1:LettheSssummarizewhattheyhavelearnedinclass.T:Now,let’sgooverwhatyouhavelearnedtoday,includingwords,phrasesandsentences.Andeachstudenthastopresentone.S1:oxygenS2:radiationS3:carbondioxide…Goovertogetherandspeakoutwhattheyhavelearnedtoday.…S1:oxygenS2:radiationS3:carbondioxide…由于网络资源的覆盖面有限，在课堂上运用互联网查找信息解决问题，很难实现，因此，该任务只能作为课后作业处理。在很多农村学校，可能课后都不能完成该任务，那就需要老师提供相关的课外读物来帮助学生。
Step2:HMK:LettheSssearchtheInternetformoreinformationaboutenvironmentalproblemsandeffects.Discusstheinformationingroupsandtakenotes.Thenwriteapassageaccordingtotheirnotesand1c.T:OK,afterclass,searchtheInternetformoreinformationaboutenvironmentalproblemsandeffects.Discusstheinformationingroupsandtakenotes.Thenwriteapassageaccordingtoyournotesand1c.SearchtheInternetformoreinformationaboutenvironmentalproblemsandeffects.Discusstheinformationingroupsandtakenotes.Thenwriteapassageaccordingtotheirnotesand1c.
Ⅶ.BlackboarddesignAlltheseproblemsareveryserious.SectionCKeywordsandphrases:hole,form,rise,oxygen,ozonelayer,referto,radiation,takeaway,carbondioxide,blanket,escape,duringthisperiod,passthrough,thegreenhouseeffectSentences:(1)Forestshavebecomedeserts,somoreandmoresortsofanimalsandplantsaredisappearing.(2)Asaresult,manyriversandlakesarenowdead.(3)Toomuchharmfulradiationfromthesunpassesthroughtheholeandreachestheearth.(4)Itcausestheleveloftheoceanstoriseandtheclimateoftheearthtochange.(5)Whenitrainsorwhenthewindblows,theearthistakenaway.(6)Theheatfromthesuncan’tescapesothetemperatureisrising.
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