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ID:50800072
大小:642.00 KB
页数:14页
时间:2020-03-14
《高三英语Telephones课件.ppt》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、Step1PresentationWhataretheydoing?123IntroductionStep24EarlyTelephonesAlexanderGrahamBell'sTelephoneAlexanderGramBellspeaksintohistelephoneStep3.ReadingReadthepassagethenfindtheanswerstothesequestionsHowwasonetelephoneconnectedwithanotherinthepast?2.Howisonetelephoneconne
2、ctedwithanothertoday?Bythickheavywires.Bysatellite.(byverythinglasspipes)ListentothetextandAnswerthefollowingquestions:1.Howdoesatelephonework?voice(soundwave)→electricalsignals—apairoflines—electricalsignals→soundwaveSpeakerphoneStep4listeningthereceivingEarlytelephone3.
3、Howaboutthewires?4.Howtomakeacallwithahandletelephone?notpopular(tookalongtime)─buy,hire─hearhandletelephone→wind(electricity)→operator→connect,note2.Weretheearliesttelephonespopular?5.Whenwasthefirsttelephonedirectoryprinted?6.Andhowmanytelephonesin1877andin1990?.telepho
4、ne┌①USA1878directory├②1877,2600└③1990,300millionStep5.Retellingthepassage1.work?Speakerphonethereceivingphonevoice(soundwave)electricalsignalsapairoflineselectricalsignalssoundwave2.earlynotpopular(tookalongtime)buy,hireheartelephonehandletelephonewind(electricity)operato
5、rconnectdifficult3.telephonedirectory①USA1878②1877,2600③1990,300million4.telephoneequipmentadvances(electricalsignalslightsignals↓)weaker→(withoutgettingweaker,clear)→instead.5.How?voiceelectricalsignalslightsignalselectricalsignalssoundStep.6HomeworkFinishofftheworkbooke
6、xercisesTrytoretellthepassage
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