Unit1NatureinthebalanceWorkbookBuildingskills?內(nèi)容分析：本板塊以“環(huán)境與環(huán)境保護”為話題創(chuàng)設(shè)情境，展開一系列聽、讀、寫等任務(wù)活動。首先閱讀一篇文章，引起大家對水污染的關(guān)注，再通過角色扮演，引導(dǎo)大家思考。接著借助兩則聽力，來了解沙漠化的相關(guān)問題，最后基于之前的聽、讀等活動，寫一篇關(guān)于沙漠化的文章。?教學(xué)目標(biāo)：Bytheendofthissection,studentswillbeableto:collectsomeusefulexpressionsafterreadingthearticleandformhisorherownviewpointtowardsStrePsactions;knowthecurrentsituationaboutdesertificationandChina'sefforttostopdesertification;writeaformalcompositionaboutdesertification.?教學(xué)重難點：Toreadthearticleandanswerthetworelevantquestions;Toorganizetheactivityofrole-play;Toguidestudentstolistentotheradioandgettheanswers;Toteachstudentshowtocomposeaformalletteraboutdesertification.?教學(xué)過程：Step1Lead-inQ:Whatcanwedotoprotectourenvironment?Step2ReadingAl:Haveyouthoughtthattherecouldbeaconnectionbetweenswimmingandprotectingtheenvironment?Readthemagazinearticleaboutamanswimmingforcleanwaterandanswerthequestionsbelow.Whatdoestheunderlinedphrase“isdevoidof'inthethirdparagraphmean?Thephrase"isdevoidof'meansacompletelackofsomething.WhatwereStrePsswimmingexperiencesinthethreeriverslike?In2000,StrclswamintheDanube,Europe'ssecondlongestriver.Hecoveredadistanceof1,866miles(3,003km)in68days.In2002,heswamintheMississippiRiverfbr2,360miles(3,798km)in68days.Hebecameverysickandstayedinhospitalfbrthreedaysafterhefinishedswimming.In2007,heswamintheAmazonRiverforadistanceof3,274miles(5,269km)in66days.Hebecameveryweakandhadtobecarriedinandoutofthewater.Keyexpressionsknowathingortwoaboutraiseawarenessof...seelawsstrengthenedandstrictlyenforcedbeheavilypollutedfromsewageandindustrialwastegoldminingoilleakspoorlymaintainedboatsA2:MartinStreltriestoraiseenvironmentalawarenessatthepriceofhisownhealth.Inpairs,discusswhatyouthinkofStrelsactions.Usetheexamplebelowtohelpyouandpayattentiontotheexpressionsinbold.IthinkMartinStrelisdoingtherightthing.Idisagree.Whathe'sdoingisverydangerous.He'sonlyharminghimself.Intheend,hisactionswon'thaveanyeffectonpollution.A:Butdon'tyouthinkthatpollutionisaseriousissue?Theproblemisthatpeoplearen'tdoingenoughaboutit.Strelisdoingalottoraiseawareness.B:Iagreethatpollutionisaseriousissue,butthereareotherswaysofraisingawareness——fbrinstance,hecouldtraveltodifferentcitiesandgivelecturesaboutitinstead.A:Idon'tthinknewspaperjournalistswouldpayanyattentiontohim一therearealreadysomanypeoplegivinglectures.Butnownewspapersaroundtheworldarewritingabouthimandpeoplearetalkingabouthim——isn'tthatproofthathe'sbeensuccessful?Usefulexpressions:haveeffecton...Don'tyouthinkthat...raiseawarenessaseriousissuefbrinstancegivelecturesabout...Isn'tthatproofthat...?Step3ListeningJustinislisteningtohisteachertalkingaboutdesertification.Listentothelectureandanswerthequestionsbelow.Whathappenswhenfarmersfarmtheirlandtoomuch?Thesoilhasnochancetorecover.Whathappenstothesoilwhentreesarecutdown?Itblowsawayinthewindorwashesawayinfloods.Whateffecthasclimatechangehadontheland?Ithasdriedoutalotofland.Whathappenstopeople'swayoflivingwhenfarmlandturnsintodesert?Peoplecannolongergrowfbodorraiseanimalsontheland.Whatpercentageofthehumanpopulationisdirectlyaffectedbydesertification?Morethan25percent.JustinandAmyarediscussingtheirresearchonChinaseffortstosolvetheproblemofdesertification.Listentotheconversationandcompletethenotesbelow.China'seffortstostopdesertificationPlantingalongstretchoftreesandbushesThisproject,calledthe“GreenGreatWall”,wasstartedintheyear(1)1978.(2)Morethan60billiontreeshavebeenplanted.BuildinglargefencesThesefences(3)stopanimalsfromeatingcertainplants,whichgivestheplantstimetogrow.SettingupamonitoringcentreThiscentretriestorecord(4)howquicklydesertsaregrowingandfindcreativenewwaystosolvetheproblem.Thecentrewasopenedintheyear(5)1995.EducatingpeopleonenvironmentalproblemsPeopleshouldlearnhowto(6)usewaterresponsibly.Desertificationisaseriousenvironmentalproblemaroundtheworld.Writeanarticleaboutdesertification.Title:Desertification,asthenamesuggests,Desertificationcanbecausedbyseveralfactors,Weneedtotakestepstopreventdesertification.Possibleanswer:DesertificationDesertification,asthenamesuggests,happenswhennon-desertareasslowlybecomedeserts.Desertificationcanbecausedbyseveralfactors,suchasglobalwarming,overpopulationanddroughts.Ifpeopleusethewrongfarmingmethodsorcutdowntoomanytrees,farmlandcanturnintodesert.Withabouttwobillionpeopledirectlyaffected,desertificationhasbecomegrowingconcernformanycountries.Weneedtotakestepstopreventdesertification,Wcshouldpayattentiontohowmuchenergyweuseinourdailylives.Thatway,wecanreducetheamountofcarbondioxidereleased.Wecanwal