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ID:55123553
大小:4.39 MB
页数:109页
时间:2020-05-10
《大学英语精读4 unit2.ppt》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、2.Warm-upExercises5.BackgroundInformationDeerBR_MAINBeforeReadingGlobalReadingDetailedReadingAfterReading3.AQuiz1.WordWeb4.AnEnglishSongEnergyCrisisEcologicalSystem(Ecosystem)BeforeReading_1_1BeforeReadingGlobalReadingDetailedReadingAfterReadingWordWebDirections:Whatwords
2、willoccurtoyouwheneverwementiontheword“energy”?Writedownasmanywordsaspossibleaboutit.ENERGYheatsolarenergywindcoalgasoilatomicenergynuclearenergyenergyresourcesenergycrisisconservationofenergy,wind,fossil,BeforeReading_2_1.1Warm-upExercisesBeforeReadingGlobalReadingDetail
3、edReadingAfterReading■Tips:Directions:Watchthevideoandwritedownthekindsofenergymentioned.Small-scalesystemstaptheenergyofflowingwater.Thesearenottobeconfusedwithbigdamprojectswhichtotallytransformecosystems,wreakingenvironmentalhavoc.MICRO-HYDRO:flowingwatersolar,chemical
4、reaction,nuclearBeforeReading_2_1.2BeforeReadingGlobalReadingDetailedReadingAfterReadingWINDPOWER:FOSSILFUELS:AnancientsourceundergoingarevivalwithmodernturbinetechnologyDerivedfromlong-deadorganicandanimalmatter.Oil,coal,andnaturalgasareallfossilfuels.BeforeReading_2_1.3
5、BeforeReadingGlobalReadingDetailedReadingAfterReadingSOLARENERGY:Thesun’spowercanbeharnessedinvariousways:byusingphotovoltaiccellstogenerateelectricitydirectly;byusingthermalcollectorstomakesteamtogenerateelectricity;byusingpassivesolarmaterialsthatmaximizeorretainthesun’
6、sheat.BIOMASS:Biomassisvegetalororganicmaterial-includingdungandplants-andbiofuelsarethesolidorliquidorgaseousfuelsthatderivefromit.Wood,methaneandalcoholareallbiofuels.BeforeReading_2_1.4BeforeReadingGlobalReadingDetailedReadingAfterReadingNUCLEARENERGY:Currentlyproduced
7、by”fission”.Anatomissplit-usinguranium-andtheheatproduceddrivessteamturbinestogenerateelectricity.BeforeReading_3_1BeforeReadingGlobalReadingDetailedReadingAfterReadingAQuizDirections:Giveeachiteminthequizanumberfrom1to5,andaddupthenumbersfromthequiztoseeHow“Green”YouAre?
8、1=always2=often3=sometimes4=hardlyever5=neverDoyou...?()1.avoidthrowingthingsawayiftheycanbereus
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