概要： wires thick, heave, expensivemake a call wind a handle / electricityoperator connect / note of length / charge telephone directory 1878 / one piece / one side 1877—2, 600 1900—300,000 000(modern telephones) great advances last quarter of the 20th Century
高中二年级Lesson 90 Reading,标签：高二英语教案大全,http://www.88haoxue.comwires thick, heave, expensive
make a call wind a handle / electricity
operator connect / note of length / charge
telephone directory 1878 / one piece / one side
1877—2, 600 1900—300,000 000
(modern telephones) great advances last quarter of the 20th Century
radio waves satellite
electrical signals weaker / strengthen 3-4 km
light signals 150 km clearer
glass pipes 1 mm / send light signals
sound→electrical signals→light signals→electrical
signals→sound
2．Here Ss may find some situations to judge which modern ways of telephones the
《高中二年级Lesson 90 Reading》出自：www.88haoxue.com网1) You're a doctor, you have to go out to see a patient, but there are still many people who want your help.
2) Every day, you call your girl friend to say “Hello” to her.
3) You are on the phone. Maybe someone has important things to tell you, but the line is busy.
4) You are a boss. You've two chain companies in two different cities. You want to discuss with the two managers about the reduction of the price immediately.
Answer： Redirection; Dialing; Call waiting; Conference calling
3．Let Ss discuss after they have grasped the general knowledge of telephones: What other functions of telephones do you want to develop? Ss may be interested in this topic. Give them time and space to imagine. Show a bridge to future to encourage students’ interest to science (on the computer).
Homework
1．Write a passage to describe the old and modern telephones by using the method of comparison.
2．Finish off the Ex. in AB.
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