选修六Unit4Globalwarming课件PPT教案资料.ppt 31页

'WordsstudyUnit4Globalwarming—Reading授课人刘胜丽 Whatcausestheglobalwarming?Humanactivityorarandombutnaturalphenomenon?Thinkabout: Carbondioxidecoaloilnaturalgasglobalwarming●●●●●●Why?FossilFuel Lookatthefollowingpictures.Whatdothepicturesshow? Humanactivity---burningoffossilfuels. Greenhouseeffect---greenhousegases---weneedthosegases. WeaddhugequantitiesofextracarbondioxidetotheatmospherebyburningFossilfuels.学科网 学科网学科网 Greenhouseeffect Whataretheeffectsanddisastersofglobalwarming? What’sworse,theglaciers(冰川）oftheSouthPolearebeginningtocrack（破裂）TheglaciersofthePolesarestartingtomeltduetotheincreasingtemperaturescausedbyglobalwarming. tsunamiThesealeveltorise. tornados Severestormsdroughtsfaminesthespreadofdiseases destructionofspecies TheEarthIsBecomingWarmer–ButDoesItMatter?Reading Fast-Reading What’sthemaintopicofthearticle?It’saboutglobalwarmingthewarmingoftheearth.skimming2.Whowrotethemagazinearticle?Whatisnameofthemagazine?TheyareDr.JaniceFoster,CharlesKeelingandGeorgeHambley.ReadingComprehensionI skimming3.Whathascausedglobalwarming?Humanactivity.4.Whatdoscientiststhinkmakestheearth’stemperaturegoup?Theburningoffossilfuels. skimming5.Howdoes“greenhouseeffect”comeabout?Itcomesaboutwhensmallamountsofgasesintheatmospheretrapheatfromthesunandthereforewarmtheearth. Trueorfalse?(P27)scanningReadingComprehensionII2Thetemperatureinthelastcenturydidn’tseemtoincreasemuch.2.Everyonebelievesthatglobalwarmingiscausedbytheactivitiesofhumans.3.JaniceFosterbelievesshecanmeasurethefutureglobalriseintemperature.4.Theriseincarbondioxideiscausingasteadyincreaseinglobalwarming.5.GeorgeHambleybelievesthatglobalwarmingwilldogoodratherthanharmtotheearth.6.Itisclearwhattheeffectsofglobalwarmingwillbe. 1.Thepurposeofthefirstparagraphisto___.introducethewriterB.explainachangeC.introducethetopicD.raiseaquestion2.Thegraphsareusedto_____.illustratepointsbyprovidingevidencetellthechangeoftemperaturetellthecontentofcarbondioxideintheairinterestthereadersskimmingReadingComprehensionIII 3.Greenhousegasesreferto_______.carbondioxideB.theburningoffossilfuelsC.byproductsoftheburningoffossilfuelsD.coal,naturalgasandoil4.Greenhouseeffect_____.A.isanaturalphenomenonB.happenswhenthere’stoomuchcarbondioxideC.doesgreatharmtohumanbeingsD.makeslifeforhumanbeingsbetterscanning 5._____foundouttheamountofcarbondioxideintheatmospherefrom1957to1997.A.Dr.JaniceFosterB.CharlesKeelingC.GeorgeHambleyD.SophieArmstrong6.WhichofthefollowingstatementsisTrue?Burningfossilfuelscausestheglobalwarming.B.Wewillhavemorefoodwithglobalwarming.C.Globalwarmingmeansdisasterstohumans.D.Moregreenhousegaseswillgatherintheatmosphere. Carefulreadingtogetdetailinformation ThedifferentideasbetweenDr.JaniceFoster&GeorgeHambley(Groupwork)Dr.JaniceFosterGeorgeHambleyCarbondioxidehascausedtheglobaltemperatureto(1)__________.Anincreaseoffivedegreeswouldbea(2)____________andcouldbe(3)______________.Morecarbondioxideisa(4)__________thing,whichmakescrops(5)_____________andwillencourage(6)____________________________.goupcatastropheveryseriouspositiveproducemoreagreaterrangeofanimals Sumary(1)Getthestudentsmasterthemethodoffast-readingandcareful-reading.(2)Getthestudentsdiscribethemainideaofthepassageusingtheirownwords.(3)Getthestudentslearntolivealow-carbonlife. Homework1.Prepareadebateingroups.2.SurftheInternetformoreinformationaboutglobalwarming.'