大学英语精读四.ppt

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1、2.Warm-upExercises5.BackgroundInformationDeerBR_MAINBeforeReadingGlobalReadingDetailedReadingAfterReading3.AQuiz1.WordWeb4.AnEnglishSongEnergyCrisisEcologicalSystem(Ecosystem)BeforeReading_1_1BeforeReadingGlobalReadingDetailedReadingAfterReadingWordWebDirections:Wh

2、atwordswilloccurtoyouwheneverwementiontheword“energy”？Writedownasmanywordsaspossibleaboutit.ENERGYheatsolarenergywindcoalgasoilatomicenergynuclearenergyenergyresourcesenergycrisisconservationofenergy,wind,fossil,BeforeReading_2_1.1Warm-upExercisesBeforeReadingGloba

3、lReadingDetailedReadingAfterReading■Tips:Directions:Watchthevideoandwritedownthekindsofenergymentioned.Small-scalesystemstaptheenergyofflowingwater.Thesearenottobeconfusedwithbigdamprojectswhichtotallytransformecosystems,wreakingenvironmentalhavoc.MICRO-HYDRO:flowi

4、ngwatersolar,chemicalreaction,nuclearBeforeReading_2_1.2BeforeReadingGlobalReadingDetailedReadingAfterReadingWINDPOWER:FOSSILFUELS:AnancientsourceundergoingarevivalwithmodernturbinetechnologyDerivedfromlong-deadorganicandanimalmatter.Oil,coal,andnaturalgasareallfos

5、silfuels.BeforeReading_2_1.3BeforeReadingGlobalReadingDetailedReadingAfterReadingSOLARENERGY:Thesun’spowercanbeharnessedinvariousways:byusingphotovoltaiccellstogenerateelectricitydirectly;byusingthermalcollectorstomakesteamtogenerateelectricity;byusingpassivesolarm

6、aterialsthatmaximizeorretainthesun’sheat.BIOMASS:Biomassisvegetalororganicmaterial－includingdungandplants－andbiofuelsarethesolidorliquidorgaseousfuelsthatderivefromit.Wood,methaneandalcoholareallbiofuels.BeforeReading_2_1.4BeforeReadingGlobalReadingDetailedReadingA

7、fterReadingNUCLEARENERGY:Currentlyproducedby”fission”.Anatomissplit－usinguranium－andtheheatproduceddrivessteamturbinestogenerateelectricity.BeforeReading_3_1BeforeReadingGlobalReadingDetailedReadingAfterReadingAQuizDirections:Giveeachiteminthequizanumberfrom1to5,an

8、daddupthenumbersfromthequiztoseeHow“Green”YouAre?1=always2=often3=sometimes4=hardlyever5=neverDoyou...?()1.avoidthrowingthingsawayiftheycanbereus