高二英语第二十三单元telephones课件VIP专享VIP免费

高二英语第二册第二十三单元欢迎老师们和同学们光临指导！ 请多提宝贵意见！ Unit 23 TelephonesSome earliest telephonesFast reading: How was one telephone connected with another in the past? How is one telephone connected with another today?  By thick heavy wires. By satellite; by very thin glass pipes.Choose the best answers.1.When you speak into the telephone , the waves of your voice are turned into ____. A.electrical sounds B.electrical signals C.light signals2.The handle of an old telephone was used for ______. A.producing enough electricity to make a call B.connecting with another telephone C.getting better electrical signals3.The job of an operator( 接线员） is _____. A.to wind the handle for customers and charge the phone calls B.to connect the two numbers, to time and charge the phone calls C.to mend telephones and telephone wires4.____ can be used to send telephone signals over long distances by satellite. A.Sound waves B.Water waves C.radio waves5._____ makes it possible for people at different places to hear one another speak. A.Redirection B.Conference meeting C.Call waiting6.The service of redirection makes sure that ______. A.you can receive calls wherever you are B.all the telephone calls can be received by your secretary C.telephone calls can be recorded if you are not at your office the earliest telephonesThe quality of theearliest telephonesAt the beginning it was difficult to hear people over a long distanceThe wires of theearliest telephonesthick ,heavy and expensiveHow to make a telephone call in those days?have to wind a handle to produce electricity.call the operator and tell her which number youwanted. The operator connected the two numbersand made a note of the length of the call a...