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1Unit5Thepowerofnature教材分析I.教学内容分析：本单元的中心话题是火山、飓风、地震和洪水等自然灾害，听说读写等语言知识和语言技能主要围绕“自然灾害”及如何预防和利用自然灾害这一主题设计的。本单元引导学生讨论大自然的危害等问题，目的在于让他们了解自然界的威力，认识到只有保护大自然，才能有效地预防自然灾害并改造和利用自然。Warmingup部分主要讨论火山、飓风和地震等自然灾害，让学生了解有关地震的知识以及预防措施等。教师可以通过右边的插图引起学生们的兴趣和好奇心而导入新课内容。Pre-reading部分设计了一个调查问卷，以帮助学生认识火山学家工作的危险性和工作本身的兴趣。他们的工作是非常危险的，因此，从事火山研究的人需要具备以下素质：1.喜欢野外工作；2.喜欢冒险；3.喜欢地质研究；4.喜欢富于变化的工作；5.喜欢与众不同的地方。Reading部分是一位火山学家的自述。作者首先介绍了他的工作性质，说明他热爱该项工作的主要原因是能帮助人们免遭火山袭击。作者的主要工作是收集基拉韦厄火山的资料，并和其他科学家一起分析和预测火山岩浆的流速和方向。火山爆发不会造成很大的损失，因为山顶附近没有居民。但是，从山上流下的熔岩会烧毁和埋没周围的城镇。然而，观看火山爆发是非常令人兴奋的，红色的熔岩喷向高空，高达数百米，甚是壮观。有一次火山爆发后，作者和另外二位科学家一道来到火山口。他们身穿白色的防护服，艰难地走到火山口，观察沸腾的火山口中央，并采集了部分岩浆以作研究。最后，作者表述了他对自己工作的热情。20年后，火山对他的吸引力依然不减。Ⅱ、教学重点和难点：1、教学重点1)本单元的生词和短语。2)现在分词作状语的各种形式。3)了解自然灾害的有关情况以及怎样预防等。2、教学难点1)了解火山爆发的原因。2)学会表述恐惧、担忧和惊奇等情感的日常交际用语。3)学习描述一种自然灾害，进行写作训练。Ⅲ、教学计划本单元共分五课时：第一课时：Warmingup第二课时：Pre-reading,Reading,Post-reading第三、四课时：LearningaboutLanguage第五课时：Integratingskills2Ⅳ、教学步骤：Period1WarmingupTeachingGoals:1.ToarouseSs’interestinlearningaboutthepowerofthenature2.TodevelopSs’listeningabilityTeachingProcedures:Step1Lead-inPurpose:ToactivateSs’andarousethemtotalkabouttwoearthquakes.Showthepicturesabouttheearthquakes.Askthestudentswherethetwoearthquakeshappened,anddiscusshowseriousthedisasterbroughttothepeople.Step2.WarmingupWarmingupbylearningvocabularyHello,everyone.Weshallreadaboutvolcanoestoday.Everydaydisastershappenhereandthere.Buthowmuchdoyouknowaboutthem?Turntopage93andfamiliarizeyourselfwiththewordsandexpressionsusedinthisunit.Trytomakeupastorybasedonthevocabulary,eitherinEnglishorinChinese.WarmingupbysharingopinionsThephotoshowsMountSt.HelenseruptingonMay18,1980.Whatdoyouknowaboutvolcanoes?Avolcanoisaplaceonearthwherelavacomesfromtheground.Volcanoesoftenhavethesameshapeasmountains.Mostvolcanoeshaveacrateratthetop.HowvolcanoesaremadeMostvolcanoesaremadewheretectonicplatescometogether.Theseplatesmoveovereachother,whichcausesmagmatorisetothesurfacethroughweakplacesinthecrust.Therearemanyvolcanoes,liveordead,intheworld.Thenextisalistofwell-knownvolcanoes.WellknownvolcanoesEatna(Sicily,Italy)Hekla(Iceland)Kilauea(Hawaii,USA)Krakatoa(Rakata,Indonesia)MaunaLoa(Hawaii,USA)MountShasta(California,USA)MountSt.Helens(Washington,USA)Novarupta(Alaska,USA)OlympusMons(Mars(planet))Popocatepetl(Mexico-Pueblastateline,Mexico)3MaunaKea(Hawaii,USA)MountBaker(Washington,USA)MountErebus(RossIsland,Antarctica)MountHood(Oregon,USA)MountFuji(Honshu,Japan)MountRainier(Washington,USA)Surtsesy(SurtseyIsland,Iceland)Santorini(SantoriniIsland,Greece)Thambora(Sumbawa,Indonesia)Teide(Tenerife,CanaryIslands,Spain)Vesuvius(BayofNaples,Italy)Step3Homework1.Writeashortcompositiontointroduceaneruptionofavolcano.2.Getonthelineandfindoutmorenaturaldisastersandletthestudentsprepareforthenextperiod.Period2&3Pre-readingReading&Post-readingGoals:1.Tolearnaboutthepowerofnature.2.Todevelopsomebasicreadingskills.3.ToarouseSs’interestinlearningaboutallkindsofdisastersintheworld.Teachingprocedures:Step1WarmingupPurpose:ToarouseSs’interestinlearningaboutthepowerofnature.Askthestudentstogetonthelineandpreparesomethingforthepowerofnatureaheadoftimeandsharetheinformationyouhavefound.WarmingupbyreadingaloudthetextANEXCITINGJOBWepromotereadingaloudtostudentsandbystudentsinordertoresultinasenseofEnglishandadesiretobecomeafluentEnglishspeaker.SoReadaloudandcirclealltheexamplesof“-ing–form”inthetext.Step2Pre-readingPurpose:Tohavethestudentslearnaboutsomenaturaldisasters.Togetthestudentslearnaboutthereasonwhythevolcanoeseruptandhowithappens.Discussthequestionswithapartner.1.Haveyoueverexperiencedatyphoon,asnowstormorahailstorm(冰雹)？Tellyourpartnerwhatitwaslike.2.Lookatthepicturebelow.Whatdoyouthinkhashappenedtothehouse?3.Readtheinformationbesidethepicture.Howdoyouthinkyouwouldfeelduringthecycloneandafteritwasover?4DARWINDESTROYEDINONENIGHTAt1amon25December1974afierce(猛烈的)cyclone(旋风)hitDarwin,acityinthefarnorthofAustralia.Windsofupto170kilometerssweptthroughthecity,tearingroofsfromhouses,pullinguptreesandturningovercars.Sevenhourslater,thecyclonemovedawayfromDarwinandallwaspeacefulagain.ThedamagetoDarwinwashugeandalmostthewholecityhadtoberebuilt.Step3Reading1.Skimmingandcanning.Purpose:Togetabriefunderstandingofthetextandtogetthestudentstohavesomedetailsinthetext.1.Readthetextquicklyandtrytogetsomedetailsfromthetext.Workinpairsandtrytoaskandanswerquestionsfromthetext.Questionscanbelikethese.(1).Whyisavolcanologist’sjobimportant?(2).WhereisMountKilauea?(3).WhyisthelavathatflowsonMountKilaueamoredangerousthantheactualeruption?(4).Whatcausedthewriter’sbedroomtobecomeasbrightasdayeventhoughitwasnight?(5).Whydidthescientistshavetogetclosetothevolcanoafteritbeganerupting?(6).Whywasitdifficultforthewritertowalktowardstheedgeofthecrater?(7).Whatdoesthewriterfindimpressiveaboutvolcanoesevenafterstudyingthemformanyyears?Suggestedanswers:(1).Volcanologistsstudyvolcanoessothattheycanwarnpeoplewhenthevolcanoisgoingtoeruptandsosavemanylives.(2).MountKilaueaisinHawaii.(3).Thelavaflowsdownthemountainandcancoveruporburnvillagesinitspat