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 Telephones,Some earliest telephones,Fast 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 signals 2.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 signals 3.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 wires,4._ can be used to send telephone signals over long distances by satellite. A.Sound waves B.Water waves C.radio waves 5._ makes it possible for people at different places to hear one another speak. A.Redirection B.Conference meeting C.Call waiting 6.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 telephones,The quality of the earliest telephones,At the beginning it was difficult to hear people over a long distance,The wires of the earliest telephones,thick ,heavy and expensive,How to make a telephone call in those days,have to wind a handle to produce electricity. call the operator and tell her which number you wanted. The operator connected the two numbers and made a note of the length of the call and the charge,The number of the earliest telephones,in 1877, 2600,the way to send signals,Metal wires were used to send electrical signals in the past. The problems with electrical signals is that they get weaker and weaker as they travel along metal wires,some modern telephones,Ericsson,Concept Phones,This small computer-like Telephone is still a mystery,telephones of the present day,Improvements that have been made,Instead of using metal wires to send electrical signals,very thin glass pipes,about 1mm wide, are used to send signals.Because light signals can travel 150 km without getting weaker,and their signals is clearer, too,cordless phones,It has no wires.it can be useful in office or in the factory. You can carry it with you and look up the information your caller wants. That is, you can walk to a distant part of the office or factory to check the information without putting down the phone,The number of telephones by 1990,300 million,the ways in which new models of telephone can be used,1. conference calling,2. dialling,3. redirection,4. call waiting,How a telephone works,When you speak into the telephone, the sound waves of your voice are turned into electrical signals. The signal is sent down a pair or wires to receiving telephone. There the electrical signal is changed back into sound,Mobile Phones In Our Life,advantages of mobile phone,It has no wires and can be carried about,It is smart,With the development of science and technology it will has more and more functions,Today,Mobile Phone is not the very thing that you can call each other.Its more than a telephone,a communicating tool.It develops to be multifunction (多功能的）and useful.With a Mobile Phone you can take photos ,listen to music,surf on the Internet,have meetings,watch TV,send E-mails and E-cards,Watch Phone a kind of mobile phone which looks like a watch,I-mode（时尚） telephone,They can download a lovely,Popular cartoon animal-Kitty Cat as the Screen Saver (屏保,The I-mode uses can connect with the Internet frequently ,Send and receive E-mails, and seek the hotels and bars,Photo-taking and song-listening Phone,You can take photos and make them into characterful（个性化的） E-cards and send out.On the top of it is a recording lens(录象镜头). The big clear screen can be convenient to browse the net page when you surf on the Internet.In addition,you can listen to music as you are enjoying the recorded video,Mobile phones which can be used for surfing on the Intent,MeetingPlate a Kind of phone used for conference calling, which has A big screen. The colored screen takes up three-fourths of the body,NTTDoCoMo 64MBMemory Download Mobile Phone,You can download songs.It is equipped Inside with a 64MB RAM内存. The most attractive thing is that it has a 256-color screen,Mobile phones which can be used to listen to music,PDA （掌上电脑）mobile phones,Lesson NinetySome important and Difficult Language Points,1.turn into (使)变成,把翻译成 Eg.Ice was turned into water by the heat. She has turned her old dress into a skirt. Can you turn the text into good English? 2.send down 把向下发送,使(温度,价格)下降 Eg.The signal is sent down a pair of wires to the receiving telephone. 这个电信号就是沿着两根导线向下发送到受话机上,3.change into=turn into,Eg.Snow has changed into water. 4.make a call=call,give a call打电话 Eg.May I use your phone? Id like to