旧人教版英语高二下Unit 23 Lesson 90
Telephone教案

知识目标:
1 Get the students to know the developments of telephones and the types in the office
2 Train the students to improve their reading abilities．
能力目标: 进一步提高学生的阅读能力
德育渗透点:让学生了解电话的发展及它给人类带来的益处，激发学生努力学习的愿望。
教学重难点:
． 名词性从句
学法指导: 让学生运用精读和泛读达到预定目标
教学过程:
Step 1 Tell the students that today we'll study telephones by the way , do you know what is its background?
Look at the pictures“What are they doing?”
Step 2 Answer some questions
1. Do you know what a telephone is used for?
It is used for communicating with others in other area.
2. How was one telephone connected with another in the past?
By thick heavy wires.
3. How is one telephone connected with another today?
Very thin glass pipes by satellite.
Please say if the followings are true or false
(1) Everyone can answer how a telephone works.
(2) The earliest telephones weren't popular.
(3) The first telephone directory was just one piece of paper, printed on both sides.
(4) By 1990, there were over 300 million telephone directories.
(5) When you speak into telephone, the waves of your voice are turned into electrical signals.
Answers: FTFFT
Language focus
1. mm into-change into
2. Over long distances-very far away
3. charge-the cost of the telephone call
4. frequently-often
5. be out of office-be not in the office
6. How a telephone works is a question which not everyone can answer
7. It took a long time before people began to hire or buy them.
8. The problem with electrical signals is that they get weaker and weaker as they travel
along metal wires.
9. It's possible to connect several telephone numbers together so that y0u can call speak.
Step 3 Intensive Reading
1. Questions and answers about the text.
(1) What happens to the sound waves of your voice when you speak into the telephone?
(2) What happens next?
(3) What did people have to do if they wanted to make a phone call in the early days?
(4) What did the operator do at that time?
(5) How many telephones were there in the year 1877?
(6) And what about by the year 1990?
(7) Why are very thin glass pipes used today instead of metal wires?
Answer:
(1) When you speak into the telephone, the sound waves of your voice are turned into
(2) Then the electrical signal is sent down a pair of wires to the receiving telephone.
Then the electrical signal is changed back into sound.
(3) In those days people had to wind a handle at the side of the telephone to produce
enough electricity to make the phone call.
(4) The operator connected the two numbers and made a note 0f the length of the telephone
(5) There were only 2 600 telephones in the year 1877.
(6) By the year 1990 there were over 300 million telephones in the world.
(7) They are used to send light signals instead of using metal wires to send electrical
signals. Because light signal can travel 150 km without getting weaker and their
signal is clearer too.
Step 4 Main idea of the text
Part 1 (Paragraph I)
How a telephone works.
Part 2 (Paragraphs 2 ~ 3)
The history of telephone.
Part 3 (Paragraphs 4 ~ 5)
The development of telephone. The telephone in the office. Different types of telephone and the different uses of them.
step 5 Discuss in pairs
1. Compared with a common telephone, what advantages does a mobile phone have?
Step 6 More vocabulary about telephone
sound waves; electrical signals; a pair of wires; wind a handle at the side of the telephone; operate; length of the telephone call and the charge; the first
telephone directory; telephone equipment; radio; light signals; me
生词表: