高三英语课件Telephones高三英语课件

Step1PresentationWhataretheydoing?123IntroductionStep24Step3.ReadingReadthepassagethenfindtheanswerstothesequestions1.Howwasonetelephoneconnectedwithanotherinthepast?2.Howisonetelephoneconnectedwithanothertoday?Bythickheavywires.Bysatellite.(byverythinglasspipes)ListentothetextandAnswerthefollowingquestions:1.Howdoesatelephonework?voice(soundwave)→electricalsignals—apairoflines—electricalsignals→soundwaveSpeakerphoneStep4listeningthereceivingEarlytelephone3.Howaboutthewires?4.Howtomakeacallwithahandletelephone?notpopular(tookalongtime)─buy,hire─hearhandletelephone→wind(electricity)→operator→connect,note2.Weretheearliesttelephonespopular?5.Whenwasthefirsttelephonedirectoryprinted?6.Andhowmanytelephonesin1877andin1990?.telephone┌①USA1878directory├②1877,2600└③1990,300millionStep5.Retellingthepassage1.work?Speakerphonethereceivingphonevoice(soundwave)electricalsignalsapairoflineselectricalsignalssoundwave2.earlynotpopular(tookalongtime)buy,hireheartelephonehandletelephonewind(electricity)operatorconnectdifficult3.telephonedirectory①USA1878②1877,2600③1990,300million4.telephoneequipmentadvances(electricalsignalslightsignals↓)weaker→(withoutgettingweaker,clear)→instead.5.How?voiceelectricalsignalslightsignalselectricalsignalssoundStep.6HomeworkFinishofftheworkbookexercisesTrytoretellthepassage