以下为课件内提取的文本内容，仅供参考：

Unit 18

inventions

1p

2pr

3c

4g

to

Four great inventions in the history of china.

PAPER

to

Printing

to

compasses

to

gunpowder

to

Lesson 78

PAPER

1. What did people use for keeping records in the beginning?

2. What's the main idea or the topic

sentence of each paragraph?

Text

1. What did people use for keeping records in the beginning?

People kept records by putting a number of stones together, carving words on animal bones, carving words on metal pots, writing on pieces of bamboo or wood.

The main idea and check points of each paragraph.

Paragraph 1

Paragraph 4

Paragraph 3

Paragraph 2

Paragraph 5

1. history in history in the history of...

history lesson ...with a long history

2. whole, all the whole country

the whole history of

all the students all of the boys all the class

Paragraph 1

As the invention of paper, much is known about the Chinese history.

Paragraph 2.

How the Chinese kept records in ancient times.

Subject clause:

It is believed that LiuMing can pass the exams.

thought that

supposed that

clear that ...

well-known that

said that

reported that

It seems that

It happened that ...

Paragraph 3

“Old kinds of paper” were still difficult to read and were very heavy to carry.

Paragraph 4

At the same time other kinds of paper were developed.

Check points:

1. be difficult for her to complete the work in time.

easy

hard

simple

interesting

2. The box is too heavy for a girl to carry.

*** ( I am too glad to see you. )

3. less hard, expensive, beautiful,

much more expensive, much harder, much less,

develop v. development n.

1.develop the habit of doing something (养成---习惯)

2. develop a film (冲洗胶卷)

3. develop a new way of doing sth

(研制,开发---新方法)

developed country (发达国家)

developing country (发展中国家)

Paragraph 5

By the first century the making of paper had become common and a paper-making factory was set up.

Check points:

common (ordinary)

common people common sense 常识

Twins often have something in common.

Is this word in common use?

time n.

after a time sometimes sometime some times

modern times some time at one time

time n, 时间,时代, 次数, 倍数

1. After a time, the injured man stod up and walked to the house.

2. She, at one time, worked as a nurse in a hospital.

3. In modern times, information

can spreads quickly.

4. I want to have a talk sometime next week.

5. Oh, I have been waiting for you for some time.

next

Please give the main idea ofthe text.

提示:

1.How people kept records in the beginning...(bamboo, bones silk, metal pot...)

2. When and how paper was first made...

3. What about in other countries...

4. When a paper-making factory was set up ...

Thanks for your attention!

Bye-bye!