Air is an odorless (无气味的), invisible (看不见的) gas that surrounds the earth. It is everywhere on the planet. An “empty” drinking glass and an “empty” room, to give two examples, are not really empty. Each is filled with air. When the glass is filled with water, the water pushes the air out of the glass.

Air, as a gas, has no definite (明确的) shape, but, because it is matter, it takes up space. It is easy to prove that air is something that takes up space. Stuff a dry handkerchief into the bottom（底部） of a glass so that it will not fall out when the glass is turned upside-down. Push the upside-down glass; hold it straight into a jar of water till the glass is completely covered. When the glass is taken out of water, the handkerchief will be dry. The air inside the glass takes up space and keeps the water from coming in.

1.What does the underlined word “Stuff” (in Paragraph 2) mean?

A．Press tightly.                           B．Take out.

C．Put down.                             D．Turn fully.

2.The writer tells us that _______.

A．the experiment is done in the laboratory

B．the experiment is done outside the room

C．the experiment is easily done

D．the experiment is carried out indoors

3.Which of the following pictures gives us the correct result?

( W—water;  A—air;  H—handkerchief )

单词拼写（共10小题；81-90每小题1分，满分10分）
根据下列句子所给汉语意思或单词首字母，写出空缺处各单词或词组的正确形式。(将单词写在答案页本题的横线上)
1. It’s quite o________ that he isn’t telling the truth because his face becomes red.
2. An old lady was killed in the hotel ,so nobody there was allowed to leave without p_________.
3. Zhao Benshan’s h__________ words made every audience present laugh.
4. We cannot e              without food as well as water.
5. Diets are most effective when they are _______(结合) with exercise.
6.Whether there is life in outer-space remains a mystery,          (使困惑) many scientists.
7. __________(恐惧) of the terrible scene, the girl ran away in terror.
8. I will never forget the __________(给人深刻印象的) speech he made. 
9. She seems g____________ (真诚的) ，but I still don’t know whether I should trust her.
10. Smoking  m___________（增加） the risk of heart attacks and other health problems.

单词拼写。

1.Tom and Jack had ___________________( 通信 ) for many years.

2.Professor Smith , an ear ____________(专家 ), organized a national survey of nose  disease in children.

3.Singing, playing games, and reading are forms of _____________(消遣)

4.The chairman is considering changes to the sex ________________(歧视)　law to promote equal opportunities.

5. A p_______ gives the owner their right to be the only one who can make , use or sell an invention or product for a particular number of years.

6.Everyone was encouraged to d________ a day’s pay to help survivors of the disaster.

7.Had not Tom dived into the river to r___________ him, the boy would have drowned.

8.A car is very h______ for people who live some little distance from town.

9.Some good sources of information can a_______ us in making the best selection.

10.his medicine is ____________( 有毒的)　if taken in large quantities.

单词拼写。（共8小题，每空1分，共8分）

1.The photo r____________ me of  France.

2.John e______ his living by selling books when he was 10 years old

3.The audience suddenly burst into l_____________ at the end of the funny story.

4.To be h_______, a lot of people attach great importance to becoming rich and famous.

5.___________(好奇心) drove Wang Peng inside.

6.China and Japan have mid-autumn festivals, when people ________ (欣赏) the moon and in China , enjoy mooncakes.

7.You shouldn’t have had your son telling people______(谎言) here and there.

8.He has lost lots of w_________ since he went on a diet .

It was until last year that he ______.

　 A. left his home town for a new start 　

B. came to realize the importance of leaving English

　 C. worked as an English teacher at a middle school 　

   D. set out to build a new house of h his own