选修六Unit4Globalwarming课件PPT教案资料.ppt

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1、WordsstudyUnit4Globalwarming—Reading授课人刘胜丽Whatcausestheglobalwarming?Humanactivityorarandombutnaturalphenomenon?Thinkabout:Carbondioxidecoaloilnaturalgasglobalwarming●●●●●●Why?FossilFuelLookatthefollowingpictures.Whatdothepicturesshow?Humanactivity---burningoffossilfuels.Greenhousee

2、ffect---greenhousegases---weneedthosegases.WeaddhugequantitiesofextracarbondioxidetotheatmospherebyburningFossilfuels.学科网学科网学科网GreenhouseeffectWhataretheeffectsanddisastersofglobalwarming?What’sworse,theglaciers(冰川）oftheSouthPolearebeginningtocrack（破裂）TheglaciersofthePolesarestartin

3、gtomeltduetotheincreasingtemperaturescausedbyglobalwarming.tsunamiThesealeveltorise.tornadosSeverestormsdroughtsfaminesthespreadofdiseasesdestructionofspeciesTheEarthIsBecomingWarmer–ButDoesItMatter?ReadingFast-ReadingWhat’sthemaintopicofthearticle?It’saboutglobalwarmingthewarmingo

4、ftheearth.skimming2.Whowrotethemagazinearticle?Whatisnameofthemagazine?TheyareDr.JaniceFoster,CharlesKeelingandGeorgeHambley.ReadingComprehensionIskimming3.Whathascausedglobalwarming?Humanactivity.4.Whatdoscientiststhinkmakestheearth’stemperaturegoup?Theburningoffossilfuels.skimming

5、5.Howdoes“greenhouseeffect”comeabout?Itcomesaboutwhensmallamountsofgasesintheatmospheretrapheatfromthesunandthereforewarmtheearth.Trueorfalse?(P27)scanningReadingComprehensionII2Thetemperatureinthelastcenturydidn’tseemtoincreasemuch.2.Everyonebelievesthatglobalwarmingiscausedbytheac

6、tivitiesofhumans.3.JaniceFosterbelievesshecanmeasurethefutureglobalriseintemperature.4.Theriseincarbondioxideiscausingasteadyincreaseinglobalwarming.5.GeorgeHambleybelievesthatglobalwarmingwilldogoodratherthanharmtotheearth.6.Itisclearwhattheeffectsofglobalwarmingwillbe.1.Thepurpose

7、ofthefirstparagraphisto___.introducethewriterB.explainachangeC.introducethetopicD.raiseaquestion2.Thegraphsareusedto_____.illustratepointsbyprovidingevidencetellthechangeoftemperaturetellthecontentofcarbondioxideintheairinterestthereadersskimmingReadingComprehensionIII3.Greenhousega

8、sesreferto_______.c