4. In fact we all know the dust is _____________________.

A. only in sunlight　　　　　　　　 B. everywhere of the universe

C. only on tables and clothes　　　　 D. in the air

3. The underlined word “duster” most probably means __________________.

A. 面罩　　　　 B. 抹布　　　 C. 除尘机　　　 D. 撒粉器

2. We can see the dust when __________________________.

A. we are in the dark　　　　　　　 B. we are in the sun

C. it flies in the air　　　　　　　　 D. strong light shows it to us

1. David stayed at home because ______________________.

　　　 A. he wanted to look at dust

B. he wanted to help his mother clean the house

C. he didn’t feel well

D. he didn’t need to go to school

5. Robert wanted _________________________________.

　　　 A. to stop playing at cards

B. to know how to make more money

C. to learn how he couldn’t wake his parents up

D. the thief to teach him how to steal

⑷David was in bed because he had been ill. Feeling better one morning, he sat up. Bright sunlight was going through the windows. “Mother!” he called out. “Come and see the tiny specks (微粒) in the air.” Mrs Lawson told David that what he could see was only dust (灰尘 ). He asked, “Why does it come in that narrow piece of air?” His mother said, “The dust is in the air everywhere. It comes through doors and windows, but we can only see it when strong light shows it to us. It is in the air we breathe, but luckily we have hairs inside our nose. They catch dust and stop it from going down our lungs.” David’s mother brought a duster and started to clean his dressing table. “See,” she said, “the dust comes down on the table, on our skin and clothes. When it is thick enough, we can see it clearly. Dust is made of soil, smoke from fires and even germs (细菌).” “Thanks, Mum,” said David. “I was feeling better. I think I had better breathe through a handkerchief so I don’t get any new germs!”

4. Robert listened carefully because he wanted to know __________________

　　　 A. if his parents went to sleep

B. if he woke his parents up

C. if it was raining hard outside

D. if someone came in

3. Why do Robert’s parents ask him to live upstairs?

　　　 A. Because they are old.

B. Because Robert doesn’t like any noise.

C. Because the room upstairs is better than the one downstairs.

D. Because they can hear if Robert goes out at night.

2. Why does Robert have to go out at night?

　　　 A. Because his friends have no time in the daytime.

B. Because he can play at cards when his parents fall asleep.

C. Because he can’t win any money in the daytime.

D. Because his parents let him do so after they go to sleep.

1. Robert’s father wants Robert ________________________.

　　　 A. to catch up with his classmates　　　

B. to be a good helper when he finishes middle school

C. to study in a university

D. to work in his shop

5.Which of the following is NOT true?________

A. The three men started their journey before the sun rose.

B .The balloon began to go up when they threw bags of sand out of the basket.

C .When they pulled the box into the basket, the balloon began to climb up.

D. The three men had to land because they felt cold.

⑶Robert is sixteen now. He’ll finish middle school in two years. His father has a shop and got much money. He hopes his son can go to university and makes him study hard. But the young man likes to play at cards. He has to go out when his parents fall asleep.

One night, when Robert came back, his father happened to see him. The old man was very angry and told his son to live upstairs. Robert has to go up and down quietly. Of course it troubles him. He thought and thought but didn’t find a way.

Last evening Robert listened carefully. And he was sure his parents went to sleep, he went out to play at cards with his friends. He won some money and was happy. And he got back, he took off his shoes and was going upstairs. He heard a noise in his parents’ bedroom. He stood behind the door and saw a man come out. He understood it was a thief (小偷). He stopped him at once. The man was very afraid and brought out all the things he stole (偷) in the room.

“Tell me how you didn’t wake my parents up,” said Robert. “Or I’ll take you to the police station!”