高二九十三课电话课件
日期：2010-10-24 10:12
Hello，everyoneUnit23Lesson90TelephonesFastreadingFindthesubjectofeachpartPara1Para2Para3Para4Para5HowatelephoneworksearliesttelephonestelephonedirectorytelephoneequipmentHowtelephonesworkChoosetherightanswer1Whenyouspeakintothetelephone，totimeandchargethephonecallsCtomendtelephonesandtelephonewires3_____makesitpossibleforpeopleatdifferentplacestohearoneanotherspeakARedirectionBConferencemeetingCCallwaiting1Howdoesatelephonework?2Whyweretheearliesttelephonesnotpopular?3Whyarelightsignalsarebetter?4Whatwayscannewmodelsoftelephonebeusedin?Post-readingHowatelephoneworks?Whenyouspeakinto…，thewavesofyourvoiceareturnedinto____AelectricalsoundsBelectricalsignalsClightsignals2Thejobofanoperatoris_____AtowindthehandleforcustomersandchargethephonecallsBtoconnectthetwonumber，thesoundwavesofyourvoiceareturnedintoelectricalsignalsThesignalissentdownapairofwirestothereceivingtelephoneTheretheelectric，
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