人教版必修二课件Unit 3 Computers Warming up and reading

Unit3WarmingupandreadingComputers Teachingaimsanddemands:Thisunitisconcernedwithteachingstudentsalittlemoreofthehistoryanddevelopmentofcomputersandtheirapplications.HelpstudentstoexpresstheirownopinionsinEnglish.Teachthemhowtomakedecisionsandreasoning.Learntointroducesomethingintimesequence.Teachthemhowtousesomeofthewordsandexpressionsintheunit.LearntouseThePresentPerfectPassiveVoice. Warmingup Lookatthepictures.Talkabouteachofthem.Discusswhattheyhaveincommonbyusingthefollowingexpressioninyourdiscussion.Ithinkthat…Inmyopinion…Ibelievethat…Whydoyouthinkso?What’syourreason? abacushugecomputercalculatorpersonalcomputernotebookcomputer Pre-reading Whatdoyouknowaboutcomputers?2.Howhavecomputerschangedourlives?Thinking AnabacusisanoldcalculatingmachineusedinChinauntilnow. Ahugecomputerisbuilttosolvesomemathematicalproblems.Butitistoobig. Acalculatorisanewcalculatingmachinewhichcansolvealargenumberofmathematicalproblems. APCisapersonalcomputerwhichcansolveallkindsofproblemsandiswidelyusednow. Anotebookcomputerisakindofusefulcomputerwhichcanbetakenconvenientlylikeanotebook. Howwassomuchinformationgiveninsuchashortspace?Whatdoyouthinkisthetoneofthewriting?Discussion Howwassomuchinformationgiveninsuchashortspace?Thewritingisclearanddoesnotwastewords.Therearenodescriptions.Itjustgivesusfacts.Itusesnamesbutitonlytellsusaboutpeople’sworkwithcomputers.Itiswritteninthefirstpersonbutitkeepswiththefacts.Itiswrittenasifthewriterwasacomputerwithnofeelings.Suggestedanswer: 2.Whatdoyouthinkisthetoneofthewriting?Itisnaturalandmakesmewanttofindoutmore.Idonotthinkthewritingistryingtopersuademetobelievesomethingbutitdoesmakemeinterestedinthetopic. Fastreading 1Whathappenedtoyouin1822?2Wherewereyouin1642?3Whatwereyoucalledin1936?4Whathappenedtoyouinthe1970s?InFrance.IwasbuiltasanAnalyticalMachinebyBabbage.Auniversalmachine.Iwasbroughtintopeople’shomes. TrueorFalse?In1642Ibeganasacalculatingmachineandcouldsolveanymathematicalproblem.MyrealfatherwasCharlesBabbage,whowroteabookandbuildmein1936.AfterIgotmynewtransistorsinthe1960s,Ibecamesmallerbutclevererandquicker.Iwasbroughtintopeople’shomesinthe1970s.SincemybirthIhavebeenbuilttotaketheplaceofhumanrace.FFTTFcalculatingAlanTuringserve Task1:Lookatthetimelinebelow.Fillintheblankswithinformationfromthereadingtext.1642:Thecomputerbeganasacalculatingmachine.1822:TheAnalyticalMachinewasmadebyCharlesBabbage.1936:Thecomputergrewrapidlybothinsizeandinbrainpower.1940s:Thecomputerhadgrownaslargeasaroom.1970s:Computersconnectpeopleallovertheworldtogether.Now:Computerswereusedinofficesandhomes.Careful-reading1960s:Thefirstfamilyofcomputerswasconnectedtoeachother. Conclusionofthetext1.What’sthemainideaofthetext?2.Howdidcomputersdevelop?Themainideaofthetextisthehistoryanddevelopmentofcomputers.CalculatingmachineAnalyticalmachineUniversalmachineArtificialintelligenceComputerInternet Shouldhighschoolstudentssurftheinternet?Ithinkhighschoolstudentsshouldsurftheinternetbecause…(first,secondly,thirdly)Ithinkhighschoolstudentsshouldnotsurftheinternetbecause…(first,secondly,thirdly…)Discussion ConclusionThereisnodoubtthatcomputerhastwosides,too.Ifwemakegooduseofit,itwillmakeourlivesmorecolourfulandconvenient.Butdon’tloseyourselfinplayingcomputers.Justremember:Keepfit,studywellandworkhard. Comprehending Whoisthespeakerinthisstory?2.Writedownthreesentencesfromthestorytosupportyouridea.Acomputer.·Thenin1822IwasbuiltasanAnalyticalmachinebyCharlesBabbage.·MyrealfatherwasAlanTuring,…·However,peoplethoughtIwassimple-mindeduntiltheydiscoveredIhad“artificalintelligence.” 1642:________________________________________:TheAnalyticalMachinewasmadebyCharlesBabbage.1936:__________________________________________________________Thecomputerbeganasacalculatingmachine1822.AlanTuringwroteabooktodescribehowcomputercouldbemade.Timeline 1960s:___________________________________________________________:Thefirstfamilyofcomputerswasconnectedtoeachother.1970s:____________________________________________Now:__________________________________________________Computershadnewtransistorsandbecomesmaller.1960sComputerswerebroughtintopeople’shomes.Computersconnectpeopleallovertheworldtogether.Timeline