Presentation on theme: "Answer the following questions 1. How was one telephone connected with another in the past? 2. How is one telephone connected with another."— Presentation transcript:
Answer the following questions 1. How was one telephone connected with another in the past? 2. How is one telephone connected with another today? By thick heavy metal wires By very thin glass pipes and satellite
electrical signals How does a telephone work?
Why did people have to wind the handle before making a call?
What did the telephone operator do?
What are satellites used for? America China
electrical signals What was the way to send signals in the past? metal wires light signals How to send signals now? thin glass pipes too noisy! not clear! very clear electrical signals electrical signals
conference calling A B C D E
call waiting A B C
A B B c redirection
Find some words to complete the sentences: 1.If you don t know the telephone number of a certain unit, you may look it up in the telephone d________. 2. This kind of food will s__________you up after your illness. 3. Please r________ all the letters to the following addresses. irectory trengthen edirect
4. We have plenty of rain here, It rains f__________ in this part of the country. 5. You must w______ the clock once a week, or it will stop. requently ind
Complete the following sentences 1. ________________________________ ( ) was a mystery. 2. ____________________________________________ ( ) has not been decided. 3. I didn t receive the news _________________________ _ ______( 4. The problem is ___________________________________ ___________ ( as they travel along metal wires. How he came to America Whether we should wear school uniforms that the meeting had been delayed that electrical signals get weaker and weaker
If you have got enough money, which of the following things do you want to have most? Give your reasons for the choice. A. A mobile telephone B. A car C. A colour TV D. A computer
Homework: 1. Read the text again and again 2. Ex.1 on Page 127.