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Lesson90
TelephonesLesson90Whataretheydoing?Whataretheydoing?Fastreading:Howwasonetelephoneconnectedwithanotherinthepast.Howisonetelephoneconnectedwithanothertoday?Bythickheavywires.Bysatellite;byverythinglasspipes.Fastreading:Howwasonetelep
Listenandanswer
1.Thenumberoftelephonein1990isnearly______timesaslargeasthatin1877.
A.1000B.10000C.100D.100000D
Listenandanswer
1.Thenu2.WhichofthefollowingisNOTtrue?____A.Thefirsttelephonewasinventedin1873.B.Lightsignalsarebetterthanelectricalsignals.C.Thethinglasspipesarecheaperthanmetalwires.D.Thelightsignalsalmostdon’tgetweakeroversolongadistance.A2.WhichofthefollowingisN3.Intheearlydays,youhadtowindahandle____.
A.toconnectthenumberyouwantedtocallB.toproduceenoughpowertomakeacallC.totelltheoperatortomakeacallD.tochangethewavesofyourvoiceintoelectricalsignalsB3.Intheearlydays,youhad4.Peopleprefertouselightsignalbecause_____.
A.theyarelighterB.theyarecheapertosendC.theyaresimplerD.theyareclearerD4.Peopleprefertouselight5.Howisamessagechangedonthetelephonenowadays?_______.A.Soundwaves→electricalsignals→sound.B.Voice→electricalsignals→lightsignals→electricalsignal→sound.C.Soundwaves→lightsignals→voice.D.Soundwaves→lightsignals→sound.B5.Howisamessagechangedonwatchparagraph1andanswerwatchparagraph1andanswerHowdoesatelephonework?voice(soundwave)electricalsignalsapairoflinesthereceivingphoneelectricalsignalsdowntoHowdoesatelephonework?voicWatchparagraph2andanswerWatchparagraph2andanswer1.Whyweretelephonesnotpopularatthebeginning?2.Whyweretelephonesexpensiveatthebeginning?3.Whydidyouhavetowindthehandlebeforemakingacall?4.Whatdidthetelephoneoperatordo?Itwasdifficulttohearpeopleoverlongdistances.Thewireswhichcarriedthetelephoneconversationswerethick,heavyandexpensive.Toproduceelectricity.Sheconnectedthetwonumbersandmadeanoteofthelengthofthetelephonecallandthecharge.1.WhyweretelephonesnotpopTheprototype（原型）
ofthefirsttelephoneinventedbyAlexanderGrahamBellin1875.
Itismadeupofacoil（卷）ofwire,amagnetic（磁的）
armandataut（拉紧的）
membrane(薄膜）.Anysoundcausesthemembrane,andhencethemagneticarm,tovibrate（振动）.Theprototype（原型）ofthefirsEarlymodelsofthetelephoneincludeEdison’s1879wall-mounted（壁挂式）phone(left),thecandlestick（烛台式）
designcommoninthe1920sand1930s(bottom),anda1937“cradle”(支架式）
telephone,astylepopularsince1890(right).Earlymodelsofthe
telephone┌①USA1878directory├②1877,2600└③1900,300million1.Whenwasthefirsttelephonedirectoryprinted?Andhowmanytelephonesin1877andin1990?ReadParagraphs3-4andanswertelephone┌①USA18781.Wh221IntheworldInChinaFixedtelephone1130226Mobilephone1050221221IntheworldInChinaFixedtElectricalsignalsLightsignalsNeedtobestrengthenedevery3-4kmCantravel150kmwithoutgettingweaker,signalisclearerUseverythinglasspipesinsteadofmetalwiresGetweakerandweakerastheytravelFibreoptics(光导纤维通讯）ElectricalsignalsLightsignalwatchparagraph5andanswerwatchparagraph5andanswerCanyoudescribethepartthatlightsignalsplayed?Voice(sound)electricalsignalselectricalsignalslightsignalsCanyoudescribethepartthatelectricalsignalselectricalsignalsThewaytosendsignalsinthepastmetalwires
lightsignals
lightsignalsNowadaysthinglasspipestoonoisy!notclear!veryclearelectrical
signalselectrical
signalselectricalsignalselectricalsomemoderntelephonessomemoderntelephonesthewaysinwhichnewmodelsoftelephonecanbeused1.conferencecalling2.dialling3.redirection4.callwaitingThetelephoneintheofficethewaysinwhich1.conferencconferencecallingconferencecallingABBcredirectionABBcredirectioncallwaiting
callwaitingWhatwouldyoudointhefollowingsituations?Afriendofyoursisillandyouhopeshe’llsoonbe
recoveredB.
Youwanttowishafriendgoodluckforanimportantexam.C.Youwanttofindoutifafriendisfreetocometothecinema.DiscussionDiscussthesequestionsinpairsWhatwouldyoudointhefolloHomeworkRetellthetext.FinishoffWbexercises.HomeworkLesson90
TelephonesLesson90Whataretheydoing?Whataretheydoing?Fastreading:Howwasonetelephoneconnectedwithanotherinthepast.Howisonetelephoneconnectedwithanothertoday?Bythickheavywires.Bysatellite;byverythinglasspipes.Fastreading:Howwasonetelep
Listenandanswer
1.Thenumberoftelephonein1990isnearly______timesaslargeasthatin1877.
A.1000B.10000C.100D.100000D
Listenandanswer
1.Thenu2.WhichofthefollowingisNOTtrue?____A.Thefirsttelephonewasinventedin1873.B.Lightsignalsarebetterthanelectricalsignals.C.Thethinglasspipesarecheaperthanmetalwires.D.Thelightsignalsalmostdon’tgetweakeroversolongadistance.A2.WhichofthefollowingisN3.Intheearlydays,youhadtowindahandle____.
A.toconnectthenumberyouwantedtocallB.toproduceenoughpowertomakeacallC.totelltheoperatortomakeacallD.tochangethewavesofyourvoiceintoelectricalsignalsB3.Intheearlydays,youhad4.Peopleprefertouselightsignalbecause_____.
A.theyarelighterB.theyarecheapertosendC.theyaresimplerD.theyareclearerD4.Peopleprefertouselight5.Howisamessagechangedonthetelephonenowadays?_______.A.Soundwaves→electricalsignals→sound.B.Voice→electricalsignals→lightsignals→electricalsignal→sound.C.Soundwaves→lightsignals→voice.D.Soundwaves→lightsignals→sound.B5.Howisamessagechangedonwatchparagraph1andanswerwatchparagraph1andanswerHowdoesatelephonework?voice(soundwave)electricalsignalsapairoflinesthereceivingphoneelectricalsignalsdowntoHowdoesatelephonework?voicWatchparagraph2andanswerWatchparagraph2andanswer1.Whyweretelephonesnotpopularatthebeginning?2.Whyweretelephonesexpensiveatthebeginning?3.Whydidyouhavetowindthehandlebeforemakingacall?4.Whatdidthetelephoneoperatordo?Itwasdifficulttohearpeopleoverlongdistances.Thewireswhichcarriedthetelephoneconversationswerethick,heavyandexpensive.Toproduceelectricity.Sheconnectedthetwonumbersandmadeanoteofthelengthofthetelephonecallandthecharge.1.WhyweretelephonesnotpopTheprototype（原型）
ofthefirsttelephoneinventedbyAlexanderGrahamBellin1875.
Itismadeupofacoil（卷）ofwire,amagnetic（磁的）
armandataut（拉紧的）
membrane(薄膜）.Anysoundcausesthemembrane,andhencethemagneticarm,tovibrate（振动）.Theprototype（原型）ofthefirsEarlymodelsofthetelephoneincludeEdison’s1879wall-mounted（壁挂式）phone(left),thecandlestick（烛台式）
designcommoninthe1920sand1930s(bottom),anda1937“cradle”(支架式）
telephone,astylepopularsince1890(right).Earlymodelsofthe
telephone┌①USA1878directory├②1877,2600└③1900,300million1.Whenwasthefirsttelephonedirectoryprinted?Andhowmanytelephonesin1877andin1990?ReadParagraphs3-4andanswertelephone┌①USA18781.Wh221IntheworldInChinaFixedtelephone1130226Mobilephone1050221221IntheworldInChinaFixedtElectricalsignalsLightsignalsNeedtobestrengthenedevery3-4kmCantravel150kmwithoutgettingweaker,signalisclearerUseverythinglasspipesinsteadofmetalwiresGetweakerandweakerastheytravelFibreoptics(光导纤维通讯）ElectricalsignalsLightsignalwatchparagraph5andanswerwatchparagraph5andanswerCanyoudescribethepartthatlightsignalsplayed?Voice(sound)electricalsignalselectricalsignalslightsignalsCanyoudescribethepartthatelectricalsignalselectricalsignalsThewaytosendsignals
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