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Unit23 lesson90

山东无棣一中

王冠清

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Self-introduction

1.Can you tell My Hobbies from the following pictures?

2.Do you know what I am doing from these pictures?

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导入新课Introduction

Can you tell me the advertisements about the following thing?

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Unit23 lesson90

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Listen to the text and Answer the following questions:

1.How does a telephone work?

1.work? Speaker phone the receiving phone

voice(sound wave)→ electrical signals —a pair of lines— electrical signals→sound wave

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Question 2

3) How to make a call with a handle telephone?

2) How about the wires?

1) Were the earliest telephones popular?

2.early ┌→not popular (took a long time ) ─ buy,hire ─hear

telephone └→handle telephone →wind (electricity)→ operator→ connect,note

Y

N

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Read Paragraph 3-5 and answer the following questions.

When was the first telephone directory printed?

And how many telephones in 1877 and in 1990?

3.telephone ┌ ①USA 1878

directory ├ ②1877 ,2600

└ ③1900 , 300 million

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Question 3

Question 4

What's the difference between electrical signals and light signals?

4.telephone— advances (electrical signals↓ ——→ light signals↓)

equipment weaker without getting weaker,clear)→instead of …

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Question 5.

Can you describe the part that light signals played?

5.How? voice→electrical signals →

light signals →electrical signals →sound

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Lesson 90 Telephones

How a telephone works is a question which not everyone can answer. When you speak into the telephone,the sound waves of your voice are turned into electrical signals.The signal is sent down? a pair of wires to the receiving telephone. There the electrical signals is changed back into sound.

The earliest telephone were not popular and it took a long time before people began to hire or buy them. At the beginning it was difficult to hear people over long distances.The wires which carries the telephone conversations were thick,heavy and expensive. In those days, to make a call, you had to wind a handle at the side of your phone. This produced enough electricity to make your call.You called the operator and told her which number you wanted. The operator connected the two numbers and make a note of the length of the telephone call and the charge.

The first telephone directory was printed in a town in the USA in 1878.It was just one piece of paper, printed on one side. In 1877 there were only 2,600 telephones in the world. By 1900 there were over 300 million.

There have been great advances in telephone equipment in the last quarter of the century. For example, radio waves can be used to send telephone signals over long distances, often by satellite. The problem with electrical signals is that they get weaker and weaker as they travel along metal wires. They need to be strengthened every 3-4 km. Light signals, however, can travel 150 km without getting weaker, and their signal is clearer too. So nowadays, instead of using metal wires to send electrical signals, very thin glass pipes, about 1 mm wide, are used to send light signals.

A person's voice is changed into electrical signals. These electrical signals are turned into light signals which are send down the "pipe". At the other end, the light signals are received and changed back into electrical signals and finally sound.

1.work? Speaker phone the receiving phone

voice(sound wave)→ electrical signals —a pair of lines— electrical signals→sound wave

2.early ┌→not popular (took a long time ) ─ buy,hire ─hear

telephone └→handle telephone →wind (electricity)→ operator→connect,note

3.telephone ┌ ①USA 1878

directory ├ ②1877 ,2600

└ ③1900 , 300 million

4.telephone — advances(electrical signals↓→ light signals↓)

equipment weaker → without getting weaker,clear)→instead of …

5.How? voice→electrical signals→ light signals →

→electrical signals →sound

复 述 课 文

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巩 固 练 习——

1：It worried her a bit _____ her hair was turning gray .

?? :while? ? :that??

:if??????? :for

2: ____ he said at the meeting astonished everybody present.

?? :What?? :That??

:The fact?? :The matter

3: _____ you don't like him is none of my business.

?? :What??? :Who???

:That?????? :Whether

名词性从句 1

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巩 固 练 习——名词性从句 2

4: They have no idea at all _____.

?? :where he has gone??????? ? :where did he go

?? :which place has he gone?? :where has he gone

5: Go and get your coat. It's ____ you left it.

?? :there?? :where?

:there where? :where there

6: They want to know ___ do to help us.

?? :what can they??? :what they can

?? :how they can???? :how can they

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小 结 summary

1：通过看图说、带着问题听、读，并在回答问题过程中构建文章Key words 框架，进行听、说、读训练。

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2：通过知识点拨，主要分析了主语从句和本文的一些重点知识。

课 后 作 业 Homework

1：利用本节课归纳的知识框架要求课后复述课文。

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2：根据本文内容写一篇80字的短文《Telephones and I In The Future》

Congratulations!

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Sorry! More efforts next time!

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Answer 解答

1 it 作形式主语，真正的是that引导的名词性从句。意为“她的头发变的花白使她有点忧虑”

2 what 引导的主语从句。意为“他在会上所说的话使在场的每一个人感到吃惊

3. That引导的主语从句，意为“你不喜欢他这件事与我无关”

4 “have no idea”意为“don’t know”,后接where引导的宾语从句。请注意名词性从句的考查重点是其陈述语序和连词。

5.本题考查where引导的表语从句。误选C、D的同学应意识到there和where是副词，不可能作先行词引导定语从句。

6.what引导的宾语从句。注意其语序和区分what和how的区别。What是疑问代词，而how是疑问副词。

Answer 解答

Answer 解答