高考英语复习 Unit4 GLOBAL WARMING (ppt).ppt

unit4globalwarming what swrongwithourearth methane carbondioxide watervapour greenhouseeffect pre reading 1 whatisagreenhousemadeofandusedfor 2 howdoesitwork agreenhouseismadeofglassandisusedforgrowingplants especiallyduringcoldweather howdoesitwork theairinsideiswarmbecausetheglasstrapstheheatfromthesunandkeepsitfromescaping thismakesthegreenhouseheatupandsotheplantscangrowthroughoutthecoldperiod whatarethe greenhousegases intheatmospheresurroundingtheearththerearegases whicharecalled greenhousegases includingcarbondioxide methane 甲烷 沼气 andwatervapor whatdoyouthinkgreenhousegasesdo theytrapheatfromthesunandthereforewarmtheearth so theearthisbecomingwarmerandwarmer butdoesitmatter yes no maybe thesealevelwillrise maybe therewillhavesomedisasters suchas flood drought famine forestfire readthetextasfastaspossibleandanswerthequestions whowrotethemagazinearticle whatisthenameofthemagazine 2 whatarenamesofthethreescientistsmentionedinthetext 3 whataretheythinkaboutglobalwarming 4 whatarethetwographsabout 5 whatisthemaintopicofthearticle whowrotethemagazinearticle whatisthenameofthemagazine sophiearmstrong thenameofthemagazineisearthcare 2 whatarenamesofthethreescientistsmentionedinthetext theyaredr janicefoster charleskeelingandgeorgehambley 3 whatdotheythinkaboutglobalwarming dotheyagreewithoneanother theydon tagreewitheachother dr janicefosterthinkstheeffectscouldbeveryserious georgehambleythinksglobalwarmingwillbemildwithfewbadenvironmentalconsequences charleskeelingbelievesitistheburningofmoreandmorefossilfuelsthatisresultinginabigincreaseincarbondioxide itshowsthatthetemperatureincreasedonedegreefahrenheitfrom1860to2000 4 whatarethetwographsabout thisgraphshowsthecarbondioxidecontentintheatmosphereincreasedsteadilyfrom1957to1997 4 whatisthemaintopicofthearticle globalwarming thewarmingoftheearth listentothetapeandtrytofindoutthefollowingstatementsaretrueorfalse ifitistrue writea t ifitisfalse writea f andthenexplainwhyitisfalse thetemperaturelastcenturydidn tincreasemuch everyonebelievesthatglobalwarmingiscausedbytheactivitiesofhumans janicefosterbelievesthatglobalwarmingiscausedbyburningfossilfuels naturalgasisagreenhousegas carbondioxideisabyproductofburningfossilfuels f f t f t 副产品 6peopleacceptcharleskeeling sdatabecausehetookaccuratemeasurements 7floodingcouldbeoneoftheeffectsoffutureglobalwarming 8georgehambleybelievesscientistsarejustguessingabouttheeffectsofglobalwarming 9georgehambleyisworriedabouttheeffectsofcarbondioxideonplantgrowth 10itisclearwhattheeffectsofglobalwarmingwillbe t t t f f whatisglobalwarming 2 howhastheglobalwarmingcomeabout 3 whataretheeffectsofglobalwarming detail readingdiscussthefollowingquestions whatisglobalwarming theearthisbecomingwarmer 2 howhasglobalwarmingcomeabout humanactivity burningoffossilfuels greenhouseeffect greenhousegases weneedthosegases fromaround315partspermilliontoaround370partspermillion hugequantitiesofextracarbondioxide from1957to1997 3 whataretheeffectsofglobalwarming badpoints 1 thesealeveltorise 2 severestorms droughts famines thespreadofdiseasesandthedestructionofspecies goodpoints 1 makeplantsgrowfaster 2 cropswillproducemore 3 encourageagreaterrangeofanimals 4 thedifferentideasbetweendr janicefoster georgehambley goup catastrophe veryserious positive produce agreaterrangeofanimals readthetextcarefullyandsumupthemainideaofeachpart part1 para1 part2 para2 3 part3 para4 8 part4 para9 partone para1 introduceadebateovertheissueofglobalwarming parttwo para2 3 ilustrate explain howglobalwarmingcomesabout listtwodifferentattitudesamongscientiststowardsglobalwarming it suptoreaderstothinkanddecidewhetherpeopleshoulddosomethingaboutglobalwarmingornot partthree para4 8 partfour para9 theearthisbecomingwarmer inyour