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1、Unit 4Global warming -Does it matterB6U4课文l理解PPT课件Warming up What kinds of energy do you know ?Where does all this energy come from ?What can we use energy for?B6U4课文l理解PPT课件Windenergyisusedaspowertoproduceelectricity. Windmills风车风车B6U4课文l理解PPT课件whereelectricityisproducedbyburningcoals.Thecoalpowers
2、tationsB6U4课文l理解PPT课件inwhichoilisrefinedandmadepure.TheOilRefineriesB6U4课文l理解PPT课件afacilitydesignedtoconvertnuclearenergyintoelectricity.AnuclearpowerplantB6U4课文l理解PPT课件ontheroofofahouseonabrightsunnydayareusedtocollectsolarenergy,makingyourhousewarmorheatingyourwater.SolarpanelsB6U4课文l理解PPT课件areuse
3、dtokeepbackwaterandraiseitslevelforirrigationorforproducingelectricity,etc.TheHydro-electricdamsB6U4课文l理解PPT课件What is the greenhouse made and used for?Pre-readingB6U4课文l理解PPT课件B6U4课文l理解PPT课件B6U4课文l理解PPT课件Agreenhouseismadeofglassandisusedforgrowingplants,especiallyduringcoldweather.B6U4课文l理解PPT课件How
4、does it work? The air inside is warm because the glass traps the heat from the sun and keeps it from escaping. This makes the greenhouse heat up and so the plants can grow throughout the cold period.B6U4课文l理解PPT课件What are the “greenhouse gases”? In the atmosphere surrounding the earth there are gase
5、s, which are called “greenhouse gases”, including carbon dioxide, methane (甲烷甲烷, 沼气沼气) and water vapor.B6U4课文l理解PPT课件What do you think greenhouse gases do? They trap heat from the sun and therefore warm the earth.B6U4课文l理解PPT课件课前准备课前准备全力投入会使你与众不同全力投入会使你与众不同你是最优秀的你是最优秀的！你一定能做的更好你一定能做的更好！请拿出你的请拿出你的导学案
6、、课本、双色笔导学案、课本、双色笔激情第一激情第一!B6U4课文l理解PPT课件要要求求1.红笔迅速修改；红笔迅速修改；认真思考错因。认真思考错因。2.如有疑问红笔标出留待讨论。如有疑问红笔标出留待讨论。目目标标达达成成A层层养成扫描式速读能力，问题全对养成扫描式速读能力，问题全对B层层在文中找到答案，问题全对。在文中找到答案，问题全对。C层层能够在文中标出每个问题的答案能够在文中标出每个问题的答案Checking answerTask:AADCB6U4课文l理解PPT课件1.PeopleacceptCharlesKeelingsdatabecausehetookaccuratemeasure
7、ments.()2.Floodingcouldbeoneoftheeffectsoffutureglobalwarming.()3.GeorgeHambleybelievesscientistsarejustguessingabouttheeffectsofglobalwarming.()4.GeorgeHambleyisworriedabouttheeffectsofcarbondioxideonplantgrowth.()5.Itisclearwhattheeffectsofglobalwarmingwillbe.()TTTFTB6U4课文l理解PPT课件内内容容1.自主学习中的疑难点。自
8、主学习中的疑难点。2.探究案探究案5个大题。个大题。要要求求1.全体起立，组内讨论解答疑问，凳子轻放于课桌下，讨论全体起立，组内讨论解答疑问，凳子轻放于课桌下，讨论完成坐下。完成坐下。2.组长协调好本组讨论内容及进度，保证高效完成组长协调好本组讨论内容及进度，保证高效完成3.组长组长安排好展示及点评人员，重点帮助弱科生安排好展示及点评人员，重点帮助弱科生。评评价价讨论投入、热烈状态分别加讨论投入、热烈状态分别加10、8、6分分Discussion 合作探究合作探究B6U4课文l理解PPT课件Task:Scanthetextandfindtheusefulphrasesanddifficults
9、entences.dependonsb/sthtodocomeaboutduetotrapheatfromthesunheatupgreenhousegasescomparedtoontheonehandontheotherhandthereisnodoubtthatconsumeenergynaturalphenomenonsubscribetogreenhouseeffectnaturalgasesB6U4课文l理解PPT课件hugequantitiesofbetrappedingouppermillionresultinashigh/lowasariseofseveralmetersin
10、thesealevelbeopposedtoencourageagreaterrangeofanimalsbuilduptendtomakeaccuratemeasurementskeeponwarmingfordecadesorcenturiesB6U4课文l理解PPT课件Task :Readthetextandpayattentiontothedifficultsentences,thentrytotranslatethem.1.Thereisnodoubtthattheearthisbecomingwarmerandthat it is human activity that has c
11、aused this globalwarmingratherthanarandombutnaturalphenomenon.2.2.翻翻译译：_ _仿写：仿写：_radioandtelevisionareimportantmeansofcommunication.（毫无疑问，收音机（毫无疑问，收音机和电视机是信息交流的重要方式）。和电视机是信息交流的重要方式）。_shewillchangehermind.(我拿不准她是否真的会改变想法我拿不准她是否真的会改变想法)。毫无疑问，全球在变暖，全球转暖是人为的，而不是随毫无疑问，全球在变暖，全球转暖是人为的，而不是随意的自然现象。意的自然现象。The
12、reisnodoubtIdoubtwhetherB6U4课文l理解PPT课件2.2.All scientists subscribe to the view that the increase in the earths temperature is due to the burning of fossil fuels like coal, natural gas and oil to produce energy.翻译：翻译：_that在句中引在句中引导导_,对对_进进行解行解释说释说明明. 在在这这种从句中，先行种从句中，先行词词多多为为 fact, news, idea, thought
13、, question, reply, report, remark 等，且等，且that不能省略。不能省略。仿写：仿写：Which journal does the library _?图书馆订图书馆订有哪些有哪些报报刊？刊？They were all very much worried over the fact_（对对你生病你生病这这件事，他件事，他们们都很焦都很焦虑虑）。）。所有的科学家都赞成这种观点：全球气温的升高是由于燃所有的科学家都赞成这种观点：全球气温的升高是由于燃烧化石燃料如煤，天然气和石油等产生的能量引起的烧化石燃料如煤，天然气和石油等产生的能量引起的同位语从句同位语从句th
14、eviewsubscribetoyoufellillB6U4课文l理解PPT课件3.3.ItwasascientistcalledCharlesKeeling,whomadeaccuratemeasurementsoftheamountofcarbondioxideintheatmospherefrom1957to1997.翻译：翻译：_此句是一个此句是一个_.句型为句型为_.仿写：仿写：Itwasaroom_.Itwasintheroom_.(它是我们过去常在开会的房子它是我们过去常在开会的房子)。_hasbrokentherecord.(是是小明打破了纪录小明打破了纪录)。有一位名叫查尔斯
15、有一位名叫查尔斯吉林的科学家曾把吉林的科学家曾把1957-1997年年期间大气层二氧化碳的含量做了精确的统计。期间大气层二氧化碳的含量做了精确的统计。强调句型强调句型itis/wasthat/whowherewewouldoftenhavemeetingsthatwewouldoftenhavemeetingsItwasXiaoMingwho/thatB6U4课文l理解PPT课件4.4.Theyalsoagreethatitistheburningofmoreandmorefossilfuelsthathasresultedinthisincreaseincarbondioxide.翻译：翻译
16、：_此句是一个此句是一个_.resultin意思是意思是_.仿写：仿写：_.（努（努力终于成功）。力终于成功）。He_andfinishedthejobintime.(他的确努力工作，按时完成工作他的确努力工作，按时完成工作)。他们还赞同下述观点：正是由于越来越多的燃烧化石燃他们还赞同下述观点：正是由于越来越多的燃烧化石燃料导致了二氧化碳的增加。料导致了二氧化碳的增加。宾语从句宾语从句(含带含带强调句型强调句型)Hardworkresultsinsuccess.导致导致didworkhardB6U4课文l理解PPT课件Sophie Armstrong did (wrote the magazi
17、ne) article. The name of the magazine is “Earth care”.2.What are the names of the three scientists mentioned in the article?They are Dr.Janice Foster,Charles Keeling and George Hambley.1.Who wrote the magazine article? What is the name of the magazine?B6U4课文l理解PPT课件3.Whatdotheythinkaboutglobalwarmin
18、g?Dotheyagreewithoneanother?They dont agree with each other.Some think the effects will be terrible, while some others believe that we should not worry about it. Dr. Janice Foster thinks the effects of global warming could be very serious.George Hambley thinks global warming will be mild with few ba
19、d environmental consequences.B6U4课文l理解PPT课件Step V SummaryTheearthisbecomingwarmingandallscientists_theviewthattheincreaseintheearthstemperatureisduetotheburningoffossil_.Some_ofthisprocessarecalled_gases,themostimportantoneofwhichis_.Weneedthesegases,buttheproblembeginswhenweaddhuge_extracarbondioxi
20、deintotheatmosphere.Itmeansthatmoreheatenergy_tobetrappedintheatmospherecausingtheglobaltemperatureto_.AscientistcalledCharlesKeelingfoundthatthecarbondioxideintheatmospherewentupfromaroundsubscribetofuelsgreenhousebyproductscarbondioxidequantitiesoftendsgoupB6U4课文l理解PPT课件315partstoaround370parts_mi
21、llionin40years.Allscientistsacceptthedateandagreetheburningormoreandmorefossilfuelsthathas_thisincrease.However,theattitudeofscientiststowardsthisriseiscompletelydifferent.Ontheonehand,Dr.Fosterthinksthatthe_whichincreasesthetemperatureby5degreeswouldbea_.Ontheotherhand,GeorgeHambley,whoare_thisview,believethatweshouldnotworryabouthighlevelsofcarbondioxideintheair.Theypredictthatanywarmingwillbe_withfewbadenvironmental_.Butnoonereallyknowstheeffectsofglobalwarming.perresultedintrendcatastropheopposedtomild/slightconsequences/resultsB6U4课文l理解PPT课件
