人教版高中英语必修2教案Unit3Computer.docx

人教版高中英语必修2教案Unit3Computer.docx

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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Unit3Computer

unit3computerpartone:

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-aplacetostoredata.email-electronicmail.ghz-gigahertz.usedoftenincorrectlytodescribethespeedofaprocessor.butwithsome2.4ghzprocessorsfasterthan3.6ghzones,itisclearthatitisjustasalesmantrick.共12页，当前第1页123456789101112load-getdatafromadisknibble-halfabytesave-putdataonadiskram–random-accessmemory（随机存取存储器）,themorethebetter.usb-universalserialbus（通用串行总线，一种简化了插接多种附件的薄型插座）www-worldwideweb,partoftheinternetii.pre-reading1.questioningandanswering‑‑‑whatdoyouknowaboutcomputer?

●electronicmachinecapableofperformingcalculationsandothermanipulationsofvarioustypesofdata,underthecontrolofastoredsetofinstructions.themachineitselfisthehardware;theinstructionsaretheprogramorsoftware.dependinguponsize,computersarecalledmainframes,minicomputers,andmicrocomputers.microcomputersincludedesk-topandportablepersonalcomputers.●amulti-functionelectronicdevicethatcanexecuteinstructionstoperformatask.●adevicethatacceptsinformation,processesit,andsuppliesanoutput.acomputerusuallycontainsmemory,acontrolunit,arithmeticandlogicalunits,andameansforinputandoutput.●aprogrammablehardwarecomponentthatiscontrolledbyinternallystoredprogramsandthatcanperformsubstantialcomputations（includingarithmeticandlogicoperations）withouthumanintervention.acomputertypicallyconsistsofoneormoreprocessingunits,memoryunits,andassociatedperipheralinputandoutputdevices.●relatedtoautomationandelectronicdataprocessing.thelibraryofcongresscommonlyclassesmostcomputer-relatedbooksinhf5548,qa75-76,z52,t385,andsometkranges.●amachineforperformingcalculationsautomaticallycalculator:

anexpertatcalculation（oratoperatingcalculatingmachines）●acomputerisadeviceormachineformakingcalculationsorcontrollingoperationsthatareexpressibleinnumericalorlogicalterms.computersareconstructedfromcomponentsthatperformsimplewell-definedfunctions.thecomplexinteractionsofthesecomponentsendowcomputerswiththeabilitytoprocessinformation.ifcorrectlyconfigured（usuallyby,programming）acomputercanbemadetorepresentsomeaspectofaproblemorpartofasystem.ifacomputerconfiguredinthiswayisgive2.discussingandsharing‑‑‑howhavecomputerschangedourlives?

somedaysoon,ifyouhaven’talready,you’relikelytoplugintothecomputernetworknationgrowinginourmidst.computerterminals,orsmallcomputersconnectedviamodem（amodulator/demodulatorcircuitforencoding/decodingcomputerchatter）toordinarytelephonelines,shouldbeasubiquitousasthetelephoneitself.they’reamuchmoreusefulandhumanetoolthanthephone,andwithcorporateamericabehindthemthenetworkswillbeeverywhere----changingourlivesmorethananytechnologysincetheautomobile.共12页，当前第2页123456789101112joiningacomputernetworkisthesameasjoiningacommunity.smallsystemsarelikevillages,wherenewmembersareformallywelcomed.thelargernetworks,thesourceandcompuserve,forexample,arecities-anonymous,fulloflifeandevents,butdifficulttofitinto.iii.reading1.listeningandreadingtotherecordingofthetextwhoami?

turntopage18andlistenandreadtotherecordingofthetext.payattentiontothepauses,pronunciationandintonationofthenativereader.2.readingaloudandunderliningexpressionsnowwearetoreadthetextonceagainandunderlinealltheexpressionsinthetext.putthemdownintoyournotebookafterclassashomework.collocationsfromwhoami?

beginas…,acalculatingmachine,bebuiltas…,followinstructionsfrom…,soundsimple,atthetime,atechnologicalrevolution,writeabook,make…work,solveproblems,becomehuge,hadartificialintelligence,gobackto…,thesizeof…,goby,changesize,becomesmallandthin,getquick,standtherebyoneself,beconnectedby…,shareinformationby…,talkto…,bring…into…,dealwith…,communicatewith…,servethehumanrace3.reading,identifyingandsettlingattention,please!

itistimetoskimthetextonemoretimeandidentifythedifficultsentences.tryanalyzingthestructuresofthedifficultsentencesanddiscussthemamongyourgroupmembers.youmayalsoputyourquestionstomeforhelp.chat（online）（在线）聊天tochatistotalkaboutordinarythingsthatarenotveryimportant.youcanchattoonepersonortomanypeople.peoplealsousethiswordnowforpartsoftheinternetwherewecantalkwithmanydifferentpeopleatthesametime.usually,youchatontheinternetinachatroomormessagingservicelikeaol（americanon-line）instantmessenger（aim）,yahoomessenger,ormsnmessenger.4.readingandtransferringscanthetextforinformationtocompletethetablebelow,describingthedevelopmentofcomputer.in1642in1822in1936in1960sin1970siv.closingdownbydoingcomprehendingexercisesturntopage18andinpairsdothecomprehendingexercisesno.1and2.period2:

asamplelessonplanforlearningaboutlanguage（thepresentperfectpassivevoice）aimstolearntousethepresentperfectpassivevoicetodiscoverusefulwordsandexpressiontodiscoverusefulstructuresproceduresi.warmingupbyreadingtothetapetobeginwith,turntopage18,listeningtoandreadingtotherecordingofthetextwhoami?

attentiongoestothepausesandintonation,aswellasthepronunciationofthereader.共12页，当前第3页123456789101112ii.discoveringusefulwordsandexpressionsinpairsdotheexercises1,2and3onpages19and20.youmustfinishthemin10minutes.iii.learningaboutgrammar1.passivevoice—overviewtenseormodelpassivesentencesimplepresentthetoeflexamisgiveneverysixmonths.simplepastthetoeflexamwasgivenlastmonth.simplefuturethetoeflexamthisyearwillbegivenonoctober15.presentcontinuousthetoeflexamisbeinggiveneveryyear.presentperfectthetoeflexamhasbeengiveneveryyearsince1950.pastperfectthetoeflexamhadbeengivenbeforethevietnamwaroccurred.simplemodalthetoeflexamshouldbegiventoeveryforeignstudent.pastmodalthetoeflexamshouldhavebeengiventoalltoenteruscolleges.2.thepresentperfectpassivevoicethestructureofthepresentperfectpassivevoiceis:

have/has＋been＋~ediv.readingaloudanddiscoveringnowgobacktopage18toreadaloudanddiscoverinthetextexamplesofthepresentperfectpassivevoice.astheyearshavegoneby,ihavebeenmadesmallerandsmaller.sincethen,myfamilyandihavebeenusedbybillionsofpeopletodealwithinformationwitheachotheraroundtheworldbytheinternet.v.discoveringusefulstructureweshalldogrammarexercises1,2and3onpage20.vi.closingdownbydoingaquizcorrectthemistakesinthesepassivevoicesentencesexample:

thehousewasbuildin1880.（correct=thehousewasbuiltin1880.）1.3000employeeswerelayingoff.2.astorywillmadeup.3.anideawasputtedforwardfordiscussion.4.hasthebookbeengivebacktoyouyet?

5.mybankloanwillbepayedoffinfiveyearstime.6.nothingcanbeholdagainstme.7.ourallieswillbelendsupport.8.shehasneverheardof.9.shewasbeingknockeddownbyabus.10.shewaslettedoffwithafine.11.thecandlewasblowoutbythedraught.12.thecriminalwerelockedup.13.thefloodwaterwasbekeptbackbybarriers.14.theinconveniencewillmadeupforbythismon