高二级lesson90(岭南画派纪念中学-彭夏桦).ppt

1、WELCOME 广州市七十六中广州市七十六中 彭夏桦彭夏桦Unit 23TelephonesreadinglisteninginformationHomeworkLesson 90discussionintroductionWhich way is faster and more convenient to connect with others?The development of telephonesAnswer the following questionsHow was one telephone connect with another in the past?By thick he

2、avy wires.How is one telephone connect with another today?By satellites;by very thin glass pipes.When you speak into the telephone,the waves of your voice and turned into_ A.Electrical soundsB.Electrical signalsC.Light signalsBThe handle of an old telephone was used for _B.Connecting with another te

3、lephoneA.Producing enough electricityC.Getting better electrical signals AThe job of an operator 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 wiresBThe first telephone directory is

4、_ A.An ordinary book B.A piece of paper C.A thick bookB_can be use to send telephone signals over long distances by satellite A.Sound waves B.Water waves C.Radio wavesCNowadays we send _ through thin“pipe”connecting persons voice from one telephone to another.A.Electrical signs B.Light signals C.Sou

5、nd wavesBQuestions discussing 1.Why were telephones not popular at he beginning?2.Why were telephones expensive at the beginning?3.Why did you have to wind the handle before making a call?5.What do you call a book containing all the customers telephone numbers?6.What are satellites used for?7.Why ar

6、e light signals better than electrical signals?4.What did the telephone operator do?The telephone in the office1.Conference calling.2.Dialing.3.Redirection.4.Call waiting.Which type the following telephones do you want to use in the future?Why?More information about telephoneHomework 1.P124 Ex.1.2.2.Go over Lesson 90