选修六+Unit4+Global+warming+课件+PPT

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

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

3、peraturescausedbyglobalwarming.tsunamiThesealeveltorise.tornadosSeverestormsdroughtsfaminesthespreadofdiseasesdestructionofspeciesTheEarthIsBecomingWarmer–ButDoesItMatter?ReadingFast-ReadingWhat’sthemaintopicofthearticle?It’saboutglobalwarmingthewarmingoftheearth.skimming2.Whowrotethemagazineart

4、icle?Whatisnameofthemagazine?TheyareDr.JaniceFoster,CharlesKeelingandGeorgeHambley.ReadingComprehensionIskimming3.Whathascausedglobalwarming?Humanactivity.4.Whatdoscientiststhinkmakestheearth’stemperaturegoup?Theburningoffossilfuels.skimming5.Howdoes“greenhouseeffect”comeabout?Itcomesaboutwhensma

5、llamountsofgasesintheatmospheretrapheatfromthesunandthereforewarmtheearth.Trueorfalse?(P27)scanningReadingComprehensionII2Thetemperatureinthelastcenturydidn’tseemtoincreasemuch.2.Everyonebelievesthatglobalwarmingiscausedbytheactivitiesofhumans.3.JaniceFosterbelievesshecanmeasurethefutureglobalris

6、eintemperature.4.Theriseincarbondioxideiscausingasteadyincreaseinglobalwarming.5.GeorgeHambleybelievesthatglobalwarmingwilldogoodratherthanharmtotheearth.6.Itisclearwhattheeffectsofglobalwarmingwillbe.1.Thepurposeofthefirstparagraphisto___.introducethewriterB.explainachangeC.introducethetopicD.ra

7、iseaquestion2.Thegraphsareusedto_____.illustratepointsbyprovidingevidencetellthechangeoftemperaturetellthecontentofcarbondioxideintheairinterestthereadersskimmingReadingComprehensionIII3.Greenhousegasesreferto_______.c