问题 单项选择题

关于无线微波扩频技术,以下______是错误的。

A.相连两点距离可以很远,适用于相连两点之间具有大量阻挡物的环境

B.抗噪声和抗干扰勇力强,适应于电子对抗

C.保密性强,有利于防止窃听

D.建设简便、组网灵活、易于管理

答案

参考答案:A

解析:[知识点] 数据通信技术基础
[评析] 微波只能进行视距传播因为微波信号没有绕射功能,所以两个微波天线只能在可视,即中间无物体遮挡的情况下才能正常接收。

阅读理解

阅读理解。

     A. Xia Chimei, 51, has become both classmate and granny of kids at Xiping Primary School in Xuan'en

county, Hubei Province. By far the oldest student at the school enrolled (入学) in first grade earlier this year.

She is now learning pinyin with children just six and seven years of age. Her husband and children encouraged

her to go to school when the new term began early this year. She had never been to school in her life.

     B. A dog owner in Dalian, Liaoning Province, was very surprised when his 4-year-old dog picked up a 5-

yuan note and gave it to him on Monday on their way to a market.

     Days earlier, Mr Ye had dropped a 10-yuan note on his sofa and let the dog pick it up for him. He then

showed the pet other notes and told it how to use money. He did that just for fun. But he never thought the

animal would take to (喜欢) dealing with money so naturally.

     C. Wang Xiaoyan, a farmer in Duanjiawan village, Shanxi Province, has carried his daughter, who suffers

from polio (小儿麻痹症) to school every day over the past 10 years.

     Wang's daughter, Wang Dan, lost the use of her legs after catching polio in 1995, at the age of three. Three

years later when it was time for Wang Dan to go to school, Wang Xiaoyan decided he would carry her. the girl

has repaid him by her excellent studies.

1. How old did Xia Chimei begin her study in Passage A?

A. 6.

B. 7.

C. 15.

D. 51.

2. What's the best title for Passage A?

A. Practice makes perfect.

B. It' s never too old to learn.

C. Clothes don't make the man.

D. The early bird catches the worm.

3. In which province did the story happen in Passage B?

A. Liaoning.

B. Hubei.

C. Fujian.

D. Shanxi.

4. What does the underlined word * repaid" mean in Passage C?

A. 付款

B. 赔偿 

C. 报答

D. 贷款

5. Which of the following is TRUE according to the passages above?

A. Xia Chimei came to school with her husband and son.

B. The dog was so clever that it taught itself to borrow money.

C. Wang Dan lost the use of her legs because of polio when she was three.

D. Mr Ye picked up a 5-yuan note and gave it to the dog on the way home.

单项选择题