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

《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