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WELCOME广州市七十六中彭夏桦Unit23TelephonesreadinglisteninginformationHomeworkLesson90discussionintroductionWhichwayisfasterandmoreconvenienttoconnectwithothers?ThedevelopmentoftelephonesAnswerthefollowingquestionsHowwasonetelephoneconnectwithanotherinthepast?Bythickheavywires.Howisonetelephoneconnectwithanothertoday?Bysatellites;byverythinglasspipes.Whenyouspeakintothetelephone,thewavesofyourvoiceandturnedinto_____A.ElectricalsoundsB.ElectricalsignalsC.LightsignalsBThehandleofanoldtelephonewasusedfor_______B.ConnectingwithanothertelephoneA.ProducingenoughelectricityC.GettingbetterelectricalsignalsAThejobofanoperatoris______A.towindthehandleforcustomersandchargethephonecalls.B.Toconnectthetwonumbers,totimeandchargethephonecalls.C.TomendtelephonesandtelephonewiresBThefirsttelephonedirectoryis____A.AnordinarybookB.ApieceofpaperC.AthickbookB_____canbeusetosendtelephonesignalsoverlongdistancesbysatelliteA.SoundwavesB.WaterwavesC.RadiowavesCNowadayswesend_____throughthin“pipe”connectingperson’svoicefromonetelephonetoanother.A.ElectricalsignsB.LightsignalsC.SoundwavesBQuestionsdiscussing1.Whyweretelephonesnotpopularathebeginning?2.Whyweretelephonesexpensiveatthebeginning?3.Whydidyouhavetowindthehandlebeforemakingacall?5.Whatdoyoucallabookcontainingallthecustomerstelephonenumbers?6.Whataresatellitesusedfor?7.Whyarelightsignalsbetterthanelectricalsignals?4.Whatdidthetelephoneoperatordo?Thetelephoneintheoffice1.Conferencecalling.2.Dialing.3.Redirection.4.Callwaiting.Whichtypethefollowingtelephonesdoyouwanttouseinthefuture?Why?MoreinformationabouttelephoneHomework1.P124Ex.1.2.2.GooverLesson90