题目内容：

One day a teacher was giving her young students a lesson on how the government works. She was trying to explain the principle of income tax (收入税).

“You see ,” she began , speaking slowly and carefully , “each person who works must pay part of his or her salary (薪水) to the government . If you make a high salary, your taxes are high. If you don’t make much money, your taxes are low .”

“Is that clear?” she asked. “Does everyone understand the meaning of income tax?” The students nodded.

Are there any questions?” she asked. The students shook their heads.

“Very good!” she said.” “Now, I would like you to take a piece of paper and write a short paragraph on the subject of income tax.”

Little Joey was a slow learner. He had lots of problems with spelling and grammar, but this time he at least seemed to understand the task.. He took his pen and after a few minutes, he handed the teacher the following composition:

Once I had a dog. His name was Tax.  I opened the door and in come Tax.

1.The teacher was trying to explain _______one day.

A. everyone should pay income tax

B. how the government works

C. the basic principles of the income tax

D. how much tax one should pay for his income

2.After the teacher’s explanation,__________.

A. not all the students understood the meaning of income tax

B. many of the students were still puzzled

C. all the students shook their heads

D. few students disagreed with their teacher

3.The students were asked__________.

A. to write a composition on “income tax”

B. to answer some questions on income tax

C. to say something about income tax

D. to explain the principle of income tax

4.Little Joey __________.

A. wrote a paragraph about his dog

B. grasped what income tax meant

C. was clear about the subject

D. did as what he was told to do