以下为课件内提取的文本内容，仅供参考：

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

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

electrical signals

What was the way to send signals in the past?

metal wires

light signals

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:

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. ________________________________ (他怎样到美国来的) was a mystery.

2. ____________________________________________ (我们是否应该穿校服) has not been decided.

3. I didn’t receive the news _________________________

_ ______(会议时间推迟了）

4. The problem is ___________________________________

___________ ( 电信号会变得越来越弱）

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.