Unit 4 Astronomy:Unit 4 Astronomy:

the science of the starsthe science of the stars

1. When the water freezes in the cold weather, it will become solid.

2. After the earth explored violently, it produces the atmosphere which was made up of oxygen, nitrogen, carbon dioxide and some other gases.

3. It is generally believed it was the water that made the earth different from other planets.

4. Too much carbon dioxide in the atmosphere prevents light from escaping from the earth into the space.

5. Whether life will continue on the earth will depend on whether the environment problem will be solved.

alternative words and expressions

hard or firm

using force to hurt or attack

scientific study of the stars

usually or widely

stop …from

natural large object that circles the sun

the changes as plants or animals grow older

burst

The covering (of something)

Way of doing things

solid

violent

astronomy

generally

prevent from

planet

development

explode

surface

method

Complete this passage with some of the above words.

My friend Li Yanping was really very interested in ___________.He liked to watch changes in the moon,the only natural satellite of the earth through his telescope. One evening he thought he saw a huge comet ________as it hit the moon. The ________of the moon produced a lot of dust that became _______like a large ball. It seemed as if it would multiply and become a new _______.Li Yanping thought he was seeing the ______________of the universe until he noticed some dirt on his telescope!he was very disappointed.

astronomy

explodesurface

solidplanet

development

• He is a great scientist living in East-Han Dynasty about 1800 years ago.

• He is the founder of astronomy, and the first man who studies earthquakes.

• Chinese people rebuilt his tomb in 1956 in honor of him.

• In 1977,a little planet in the solar system numbered 1082 was named after his name in order to remind people of his significant contributions for human.

Zhang Heng

What he did for human in astronomy will be remembered by all.

How he observed the stars attracts me very much.

Why he was interested in astronomy is unknown.

What do the above sentences have in common ? 主语从句（ Noun Clauses as the Subjec

t ）

主语从句用作主语的从句叫主语从句，它是名词性从句之一。

What time I go to bed is fixed.

Their destination is unknown.

Where they are going is unknown.

My bedtime is fixed.

连词 that, whether ；连接代词 who, what, which, whoever, whatever ；连接副词 when, where, how 和 why 。

引导主语从句的连接词：

1.Light travels in straight lines. It is known to all.

Combine the sentences into one:

That light travels in straight lines is known to all.

2.Will we hold a party in the open air tomorrow? It depends on the weather.

Whether we will hold a party in the open air tomorrow depends on the weather.

3.What does he want? It is a book. What he wants is a book.

4.Which car will you choose to buy ? It makes no difference.

Which car you will choose to buy makes no difference.

What rules have you learned?

Which car you will choose to buy makes no difference.

That light travels in straight lines is known to all.

谓语动词用单数

从句用陈述语序

不能省略关联词

1 ） It + be + 形容词 + that- 从句

It is a pity that you missed the film.

It is a fact (a shame, a pity, good news…) that…

It is necessary (clear , true ,strange,important …)that

2 ） It + be + 名词 + that- 从句

It is still uncertain whether he is coming or not.

it 作形式主语的 that- 从句

4) It + 及物动词（被动语态） + 主语从句It has been decided that the exhibition will not open on Sundays.

3 ） It+ 不及物动词 + 主语从句It seemed (happened, doesn’t matter, has turned out) that… It happens that they were absent.

Talk about problems in your study or life. The others should give some advice or suggestions.

My advice is ……

My suggestion is ……

What I think about it is ……

The fact is ……

My advice is ……

My suggestion is ……

What I think about it is ……

The fact is ……

……is my problem.

……is my trouble.

……is my difficulty.

……is my question.

1. ____ you don’t like him is none of

my business.

A. What B. Who

C. That D. Whether

2. ____ he said at the meeting

astonished everybody present.

A. What B. That

C. The fact D. The matter

C

A

4. _____ we’ll go camping tomorrow

depends on the weather.

A. If B. Whether

C. That D. Where

B

3. The Foreign Minister said, “____ our

hope that the two sides will work

towards peace.”

A. This is B. There is

C. That is D. It is D

5. ____ leaves the room last ought to

turn off the lights.

A. Anyone  B. The person

C. Whoever  D. Who

6. ___ is a fact that English is being

accepted as an international language.

A. There B. This

C. That D. It

C

D

7. ___ in the newspaper that the price

of food will go up.

A. It says B. It is said

C. It has said D. He is said

8. It worried her a bit ________her

hair was turning grey.

　 A. while B. that C. if D. forB

B

Write a short passage on the

topic “My Problem”, making

use of the subject clauses.