人教版高二英语选修六第四单元课文预习PPT课件.ppt

Akindsofcatastrophes,Tsunami海啸）,Hurricane,Flood,Mud-rockflow,Typhoon（台风）,Volcano(火山）,Hailstone（冰雹）,Fire（火）,Earthquake,Whatcausesthem?,Unit4,-warmingupandreading,Globalwarming,energysources,Wedependonenergytodomanythingsinourdailylives.Forexample,energylightsourcitiesandheatsourbuildings.Makealistofthingsthatuseenergyinyourhome,inyourschool,oranyotherplacesyoucanthinkof.,stove,light,thingsthatuseenergyinyourhome,micro-waveoven,cassetteplayer(卡式录音机）,heating,television,hairdryer,videoplayer,fridge,computer,washingmachine,stove,Windenergyisusedaspowertoproduceelectricity.,Windmills,whereelectricityisproducedbyburningcoals.,Thecoalpowerstations,inwhichoilisrefinedandmadepure.,TheOilRefineries,afacilitydesignedtoconvertnuclearenergyintoelectricity.,Anuclearpowerplant,ontheroofofahouseonabrightsunnydayareusedtocollectsolarenergy,makingyourhousewarmorheatingyourwater.,Solarpanels,areusedtokeepbackwaterandraiseitslevelforirrigationorforproducingelectricity,etc.,TheHydro-electricdams,Anenergysourceis“renewable”whensuppliesofitneverrunoutand“non-renewable”whenonedaytheywillrunout.Whichenergysourcesonyourlistarerenewableandwhicharenon-renewable?,Discuss,Sourcesofenergy,Renewable/non-renewable,coal,oil,naturalgas,wind(windpower),sun(solarenergy),non-renewable,non-renewable,non-renewable,renewable,renewable,Whatarethesebuildingsmadeofandwhatistheirpurpose?,Theyaremadeofglassandplantscangrowinitwhenitiscoldoutside.,Howdoesitwork?,Theglasstrapstheheatfromthesun,makingtheairwarmsothatplantscangrowbetter.,Greenhousegases!,Whatsgreenhousegaseseffect?,Greenhousegasesperformthesamefunctionastheglassinagreenhouse-Theytraptheheatofthesunandkeeptheairsurroundingtheearthwarm.Itiscalledthegreenhouseeffect.,TheEarthIsBecomingWarmerButDoesItMatter?,Pleaselookatthefollowingvedio.,FastReading,Glanceatthearticleandanswerthequestion.,Whatisthestructureofamagazinelikethisandhowisthetextorganized?,Readingcomprehension,Readthearticleagainandfinishcomprehendingonpage27,SophieArmstrongwrotethemagazinearticle.Thenameofthemagazineis“Earthcare”.,2.Whatarethenamesofthethreescientistsmentionedinthearticle?,TheyareDr.JaniceFoster,CharlesKeelingandGeorgeHambley.,1.Whowrotethemagazinearticle?Whatisthenameofthemagazine?,3.Whatdotheythinkaboutglobalwarming?Dotheyagreewithoneanother?,Therearesomeverydifferentattitudesamongscientiststowardsthisissue.Somethinktheeffectswillbeterrible,whilesomeothersbelievethatweshouldnotworryaboutit.,4.Whatarethetwographsabout?,Graph1showsthetemperatureincreaseofonedegreeFahrenheitbetween1860to2000.,Graph2showsthecarbondioxidecontentintheatmospherefrom1957to1997.,Graph1:,Graph2:,5.Whatisthemaintopicofthearticle?,Globalwarming/Thewarmingoftheearth.,Homework,Preparethelanguagepointsofthispassageandunderlinetheimportantones.Reviewthereadingpassage.Finishusefulwordsandexpressions.,1.Thetemperaturelastcenturydidntincreasemuch.2.Everyonebelievesthatglobalwarmingiscausedbytheactivitiesofhumans.3.JaniceFosterbelievesthatglobalwarmingiscausedbyburningfossilfuels.4.Naturalgasisagreenhousegas.5.Carbondioxideisabyproductofburningfossilfuels.6.PeopleacceptCharlesKeelingsdatabecausehetookaccuratemeasurements.,Readthearticlec