人教版高中英语必修2教案Unit3Computer人教版高中英语必修2教案Unit3Computerunit3computerpartone:teachingdesign(第一部分：教学设计)period1:asamplelessonplanforreading(whoami?)aimstotalkaboutcomputertoreadaboutcomputerproceduresi.warmingupwarmingupbytalkingaboutcomputerlookatthepicturesonpage17.whatarethey?whatdotheyhaveincommon?yes,theyarecomputers.thenwhatisacomputer?acomputerisamachinewhichstoresknowledgeinitsmemoryanddoescalculationsonthatknowledge.thisknowledgeisstoredinsymbols;itiscalleddata.acomputerusuallyhasamonitortoshowresults.however,somecomputerscanspeak;thesecomputerscanbeusedforvoicemail.计算机室acomputerfrequentlyrequiresabootdevice.thebootdevicecontainsthecomputer’soperatingsystemanddata.computerprogramscanbeinstalledontoacomputer.somepeoplethinkthatcomputersarelessusefuliftheydonothaveaccesstotheinternet.theythinkthisbecausetheinternetallowsthecomputerstosendandreceivedataandemailacrosstheworld.曙光3000巨型计算机acomputerisnowalmostalwaysanelectronicdevice.itusuallycontainsmaterialswhicharetoxic;thesematerialswillbecometoxicwastewhendisposedof.whenanewcomputerispurchasedinsomeplaces,lawsrequirethatthecostofitswastemanagementmustalsobepaidfor.thisiscalledproductstewardship.insomecountriesoldcomputersarerecycled(melteddown)togetgoldandothermetals.thisisdangerous,becausethisprocedurereleasesthetoxicwasteintothewaterandsoil.computersbecomeobsoletequickly.veryoftentheyaregivenawayandnewonesreplacethemwithintwoorthreeyears.thismakestheproblemworse.computerrecyclingisthuscommon.manyprojectstrytosendworkingcomputerstodevelopingnationssotheycanbere-usedandwillnotbecomewasteasquickly.computerjargon计算机行话computerjargonmeanswordstodowithcomputersandsurroundingtopics.knowingwhatthesewordsmeancanhelpyouknowmoreaboutcomputers.somepeopleusethesewordstoimpressotherpeople(alsoknownasbuzzwords).examplesofjargon:bit-thesmallestdataunit,caneitherbea“0.”ora“1.”.byte-unitofdata.seealsokilobyte,megabyte,gigabyteandnibblecpu–centralprocessingunit,anothernameforprocessordata-informationstoredonacomputerdisk-aplacetosto