高中英语 选修六 4.5《Unit 4　Reading》课件 40页

新课标人教版课件系列《高中英语》选修(模块）6-4.5\nReading\nWhatisthegreenhousemadeandusedfor?\n\n\nAgreenhouseismadeofglassandisusedforgrowingplants,especiallyduringcoldweather.\nHowdoesitwork?Theairinsideiswarmbecausetheglasstrapstheheatfromthesunandkeepsitfromescaping.Thismakesthegreenhouseheatupandsotheplantscangrowthroughoutthecoldperiod.\nWhatarethe“greenhousegases”?Intheatmospheresurroundingtheearththerearegases,whicharecalled“greenhousegases”,includingcarbondioxide,methane(甲烷,沼气)andwatervapor.\nWhatdoyouthinkgreenhousegasesdo?Theytrapheatfromthesunandthereforewarmtheearth.\nMainideasofeachpartWritingtechniques(Paragraph1)Introduceadebateovertheissueofglobalwarming.Raisingaquestion\nMainideasofeachpartWritingtechniques(Paragraphs2---4)Illustratehowglobalwarmingcomesabout.Givingexamples,usinggraphs,explanation.\n(Paragraphs5---10)Listtwodifferentattitudesamongscientiststowardsglobalwarming.Givingexamples,makingcontrast.\n(Paragraph11)It'suptoreaderstothinkanddecidewhetherpeopleshoulddosomethingaboutglobalwarmingornot.Usingaquestion,leavingreaderstothinkovertheissue.\nComprehending\n浓度单位\nGlancequicklyatthemagazinearticleandanswerthequestions.Whowrotethemagazinearticle?Whatisthenameofthemagazine?SophieArmstrongwrotethemagazinearticle.ThenameofthemagazineisEarthCare.\nWhatarethenamesofthethreescientistsmentionedinthearticle?TheyareDr.JaniceFoster,CharlesKeelingandGeorgeHambley.\n3.Whatdotheythinkaboutglobalwarming?Dotheyagreewithoneanother?Theydon'tagreewitheachother.Dr.JaniceFosterthinkstheeffectsofglobalwarmingcouldbeveryserious.\nGeorgeHambleythinksglobalwarmingwillbemildwithfewbadenvironmentalconsequences.CharlesKeelingbelievesitistheburningofmoreandmorefossilfuelsthatisresultinginabigincreaseincarbondioxide.\nWhatarethetwographsabout?GraphIshowsthetemperatureincreaseofonedegreeFahrenheitbetween1860to2000.Graph2isaboutthecarbondioxidecontentintheatmosphere,1958--1990.\nWhatisthemaintopicofthearticle?Globalwarming/thewarmingoftheearth.\n2.True:3,5,6,7,8False:1,2,4,9,10Correctsentences:1.Thetemperaturelastcenturyincreasedmuch.2.Noteveryonebelievesthatglobalwarmingiscausedbyhumanactivities.\n4.Naturalgasisnotagreenhousegasbutafossilfuel.9.GeorgeHambleythinksthatmorecarbondioxideisapositivethinganditwillmakeplantsgrowfaster.10.Itisunknownwhattheeffectsofglobalwarmingwillbe.\nDebateInstructions●Getintogroupsofsix.Decidewhichthreeinyourgrouparegoingtoagreewiththestatement(GroupA)andwhichthreearegoingtodisagreewiththestatement(GroupB).\n●GroupAdiscusswhytheyagreewiththestatement;GroupBdiscusswhytheydisagree.●GroupAandBgettogether.Telleachotherthereasonswhyagreeordisagreewiththestatement.\nSupplementarymaterialsfordebatingGlobalwarming1.Theplanethaswarmedanywherefrom0.5to1.0°C(1to2°F)overthelastcentury.\nThissmallamountmakesahugedifference,causingglacierstomeltand,potentially(潜在的),sealeveltorise.Wecouldseeevenmoreofthisinthefuture,(maybeanother3°C,or5°F)\nglobalwarming\nglobalwarming\n2.Adefinitionofglobalwarmingwouldhavetoincludeameasurable,consistenttemperaturerise,liketheonewehaveseeninrecenthistory.Aquestionremains–Isitanunusualchange?Muchdebateaboutthatone.\n3.Theearthgetsonekindofenergy(visiblelight)fromthesunandgivesoffanotherkind(infrared红外线).Thiskindiswhatgetstrappedby"greenhousegases"(GHG's)intheatmosphere.\nGreenhousegases4.Theglobalwarminggreenhouseeffectreallyisabogus(假的)term.Agreenhousekeepswarmbyphysicallytrappingtheairinsideandpreventingconvection(对流).\nTheatmospherehelpskeeptheplanetwarmbytrappingoutgoingradiationinstead.\n5.TheleadinggassesareCarbon-dioxide,Methane,Ozone(臭氧)andNitrousOxide(一氧化二氮).Gasanalyzersshowtheconcentrationsofthisstuffhaveincreasedsomewhatsincethebeginningoftheindustrialrevolution.\n6.ThegreenhouseeffectraisestheaveragetemperatureoftheEarthbymorethan30degrees,sowithoutittheEarthwouldbeaverycoldplace!\ngreenhouseeffect\ngreenhouseeffect\nGREENHOUSEFeelinghelplesstodoanythingaboutglobalwarming?Findouthowonefamilycuttheirownpersonalgreenhouse-gasemissionsby65percent--andhowyoucandothesame.\ngreenhouseeffect\nHomework1.Readthepassageagainandreviewthenewwordsandexpressions.2.Preparethedebateingroups.3.PreviewUsingLanguage--WHATCANWEDOABOUTGLOBALWARMING?