北师大版高中英语必修2 Unit 4 全套课件

Unit4Cyberspace教材背景链接Imaginationismoreimportantthanknowledge.—AlbertEinstein想像力比知识更为重要。——阿尔伯特·爱因斯坦Anythingonemancanimagine，othermencanmakereal.—JulesVerne，FrenchWriter但凡人能想像到的事物，必定有人能将它实现。——法国作家凡尔纳名言佳句类文欣赏WillEmailReplaceLetterwriting?TheStateofLetterwritingTotrulyknowthedeclineofletterwriting，it’sbesttolookatsurveysoftheyoung.Twoyearsago，asurveyfoundthatathirdof16to19yearoldgirlshadneverwrittenaletter，whileamongboys，thefigurewasoverahalf.Whendidyoulastwriteaproperlettertoaclosefriendorfamilymember？Wheredoyoukeepyourwritingpaperandenvelopes?Iftheletterreallyisdisappearingfast，nowmightbeagoodtimetochewoverwhatweareabouttolose.TheEffectofEmailThecomingofemailhasplayedmuchthebiggestroleinthefate(命运)oftheletter.“IntheVictorianera，letterwritingwaswhatpeopledidintheirsparetime，andthentheyreadtheletterstoeachother.Inaway，itwasthenews，asmuchasanything，”thenovelistA．S.Byattsays.Thereisonlyoneproblem：whathertrustoncomputerbasedcommunicationwillmeanforherworks.“I’vebeentalkingtothepeopleintheBritishLibrary，whoareinterestedinmyarchive(档案文件)，butit’snotgoingtobeeasyforthem，becausetechnologykeepschanging，”shesays.“Veryoften，theycan’treadthecomputermaterialthey’vecollected.Atlastthey’dliketotakeawayacopyofmyharddisk.Theystillloveinkonpaper.”TheProblemsBiographersWillMeetAndsowearriveatoneofthemoreworryingresultsofthechangefrompapertocomputers：ifemailsnownotetheprogressofimportantlivesdown，howwillfuturebiographersmanage?“Fromthatpointofview，it’sacompletelydisappointingthing，”saysthenovelistandbiographerD．J.Taylor，whoseLifeofWilliamMakepeaceThackerayusedalotofhandwrittenletters.“Thackerayalwaysthoughtthathewasn’tmuchofaletterwriter，buthewrote15everymorning.Insomeways，it’stheonlywaythatyoucanfollowhislife.”“Longlettersbetweenpeoplewhoknoweachotherwellarequiteacomplicated(复杂的)wayoftalk，”hesays.“Theproblemisnotsomuchthedifferencebetweentheletterandtheemail；theproblemiswhetheranybodyisgoingtokeepthoseformsofcommunication.Ifyou’reafamouswriter，andyou’resendingemailstoyourfriends，areyougoingtocopythem？Idon’tknow.”TheFutureofLetterwritingBehindthedisappointingstatistics(统计数字)，letterwriterscanfindcauseforhope.Thesimplenumberoflettersmayseemtobefalling，buttherearesignsofinterestintheworldofpaper，envelopes，andtripstothepostoffice.PerhapsthebestexampleofallthisisthesuccessofthestationerysoldbySmythson.“TheneedforSmythsonstationery，”saysacompanyspokeswoman，“showsthefactthatinthistimeofadvancedtechnology，thewrittenwordismorecelebratedandappreciatedthaneverbefore.”Task：TrueorFalse1．16to19yearoldboysneverwriteletters.()2．NovelistA．S.Byatthasusedthecomputertowriteherworks.()3．Thackerayhastowritelettersbecausehedoesn’thaveacomputer.()Keys：1.F2.T3.FSectionⅠWarmup&Lesson1速效提能演练Unit1重点难点探究SectionⅠ预习多维感知►StepOne：AskandDiscussionComparedto20yearsagohowdoyouthinktechnologywillchangeourlives?____________________________________________________________________________________________________________________________________________________________________预习多维感知答案：Wehavemorecarsandcomputerswhich/thataremoreandmorepopular.Goshoppingonline.Needn’tcarrycashandusecreditcards.Insteadofgoingtothebankyoucanuseacomputerandatelephonetopayforbills.►StepTwo：FastReadingReadthetextandjudgethefollowingstatementsistrue(T)orfalse(F)．1．Inspiteofthedevelopmentofcomputers，itisunlikelytoliveinvirtualreality.()2．ThetextinferstousthatworryisnecessaryandcomputersandtheInternetmaydobadtous.()3．Itiscertainthatinthefuturechildrenwillnotgotoschoolintheclassroomlikeus.()4．Accordingtothetext，itispossiblethatpeopleliveinanotherworldofouterspace.()5．Invirtualreality，youcangotoworkbutneedn’tgototheplaceyourself.()6．BecauseoftherapiddevelopmentofInternet，televisionandthemailmaydisappearandarereplacedbycomputers.()答案：1～6FTFFTT►StepThree：CarefulReadingⅠ.Choosetherightanswers.1．Thewriterwritesthispassageinorderto____.A．showusthebrightfutureofcyberspaceB．tellpeoplethedisadvantagesoftheNetC．buildupthefuturepictureoftheinfluenceoftheNetonourlifeD．makepeopleknowabouttheadvantagesoftheNet2．Wecaninferfromthepassagethat_______.A．cyberspacewillaffectpeople’slifegreatlyB．communicatingwithyourfriendsontheInternetisalwayssecretC．theNetissuretohaveagoodeffectonpeople’slifeD．theNetissuretohaveabadinfluenceonpeople’slife3．AngelaRossettothinksthat________.A．emailwillsurelyreplacemailB．mostpeoplethinktheNethasabrightfutureC．peoplewillbookticketsfromtheNetD．moreandmorepeoplewillbuywhattheyneedontheNet4．Theword“chaos”inthesecondparagraphcanbereplacedby________.A．anaccidentB．adisorderedsituationC．afireD．aninterruption5．Themainideaofthelastparagraphis________.A．peoplecandoeverythinginvirtualrealityB．cyberspacewillplayanimportantroleinpeople’slifeC．thepredictionofourlifeinvirtualrealityD．peoplecannotlivewithouttheNet答案：1～5CADBCⅡ.Readthetextandfillintheblanks.Title：TheFutureofCyberspaceThe1._______inthenumberofthecomputersIn1983：Only200computerswere2.____________totheInternet.Now：Therearearound50million.Inthefuture：Thegrowthisgoingto3.___________.PessimisticopinionsOneworryis4.____________incyberspace.Hacker