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ID:8433271
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时间:2018-03-27
《2018学年高中英语 Unit 4 Global warming Section Ⅰ Warming amp;Reading Pre-reading教学案 新人教版-选修6》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、-Unit4GlobalwarmingThegreenhouseeffectistheriseintemperaturethattheEarthexperiencesbecausecertaingasesintheatmosphere(大气;大气层)trapenergyfromthesun.Withoutthesegases,heatwouldescapebackintospaceandEarth'saveragetemperaturewouldbeabout60°Fcolder.Becauseofhowtheywarmourworld,the
2、segasesarereferredtoasgreenhousegases.,Haveyoueverseenagreenhouse?Mostgreenhouseslooklikeasmallglasshouse.Greenhousesareusedtogrowplants,especiallyinthewinter.Greenhousesworkbytrappingheatfromthesun.Theglasspanels(面,板)ofthegreenhouseletinlightbutkeepheatfromescaping.Thiscaus
3、esthegreenhousetoheatup,muchliketheinsideofacarparkedinsunlight,andkeepstheplantswarmenoughtoliveinthewinter.,TheEarth'satmosphereisallaroundus.Itistheairthatwebreathe.Greenhousegasesintheatmospherebehavemuchliketheglasspanes(窗玻璃)inagreenhouse.SunlightenterstheEarth'satmosph
4、ere,passingthroughtheblanketofgreenhousegases.AsitreachestheEarth'ssurface,land,water,andbiosphere(生物圈)absorbthesunlight'senergy.Onceabsorbed,thisenergyissentbackintotheatmosphere.Someoftheenergypassesbackintospace,butmuchofitremainstrappedintheatmospherebythegreenhousegases
5、,causingourworldtoheatup.,Thegreenhouseeffectisimportant.Withoutthegreenhouseeffect,theEarthwouldnotbewarmenoughforhumanstolive.Butifthegreenhouseeffectbecomesstronger,itcouldmaketheEarthwarmerthanusual.Evenalittleextrawarmingmaycauseproblemsforhumans,plants,andanimals.Secti
6、on_ⅠWarmingUp&Reading—Prereading15-THEEARTHISBECOMINGWARMER—BUTDOESITMATTER?Duringthe20thcenturythetemperatureoftheearthroseaboutonedegreeFahrenheit①.Thatprobablydoesnotseemmuchtoyouorme,butitisarapidincreasewhencomparedto②othernaturalchanges③.Sohowhasthiscomeabout④anddoesit
7、matter?EarthCare'sSophie⑤Armstrong⑥exploresthesequestions.Thereisnodoubtthattheearthisbecomingwarmer(seeGraph⑦1)andthatitishumanactivitythathascausedthisglobalwarmingratherthanarandom⑧butnaturalphenomenon⑨.①Fahrenheit/'færənhaIt/adj.华氏的n.华氏温度计②comparedto与……相比③whencomparedto.
8、..是“when+过去分词”结构,也可看作时间状语从句的省略,补充完整为whenitiscomparedto...。④comeabout发生;造成,为
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