问题 单项选择题

周期与某个脉冲中的循环周期数之积为()。

A.脉冲重复频率

B.连续波

C.脉冲重复周期

D.脉冲宽度

答案

参考答案:D

单项选择题 A1型题
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阅读理解

Dear Mom,      

       I don't  think  you understand my life. You think I should be studying all the time. I know you want

me to find a good job when I grow up, but I would like to have a wonderful  time,  too.  You never think

about fun things for me to do like music, sports. Two days ago, when I was watching a football game on

TV, you asked me to stop and do my homework. After finishing my homework, still I couldn't read my

football magazines. You said I had to go to bed early. That was bad enough, but yesterday was the worst day. I bought some computer games, and put them in my bag so that you wouldn't see them. I told you I

had to do my homework first. I  knew it was wrong to lie to you, but Mom, I didn't quite like what you

did to me! I really love you, Mom, but I wish you could try not to be so hard on me.

                                                                                                                                                     Love ,

                                                                                                                                              Zhang Ning

1. Zhang Ning's mother wants him to_______ when he grows up.

A. be a good teacher      

B. find a good job

C. work in a big city      

D. have a good time

2. Zhang Ning' s mother asks him to              

A. study all the time    

B. do sports

C. watch TV                

D. tell a lie

3. Why did Zhang Ning put the computer games in the bag? Because _________.

A. he didn't like them

B. he played them many times

C. he wouldn't let his mother find them

D. he would play them at school

4. What do you think Zhang Ning should do?

A. He  should argue with his mom.

B. He  should have a fight with his mom.

C. He  shouldn't talk to his mom.

D. His letter could help his mother understand him  better.

5. What's the meaning of the underlined word "lie"?

A. 躺      

B. 离开

C. 撒谎    

D. 告诉