问题 单项选择题

宽带综合业务数字网B-ISDN的数据通信服务主要采用______。

A.帧中继技术

B.ATM技术

C.电话交换网技术

D.25网技术

答案

参考答案:B

解析:[知识点] B-ISDN的数据通信技术[评析] 综合业务数字网(ISDN)有两种:宽带综合业务数字网(B-ISDN)和窄带综合业务数字网(N-ISDN)。和传统的N-ISDN采用同步时分多路复用技术不同,B-ISDN采用的是异步传输技术(ATM技术)。

阅读理解

阅读理解。

     This is a talk by a London taxi(出租车)driver.

     "I've been a taxi driver for nearly ten years. Most London taxi drivers

have their own taxis."

     "It's a nice job most of time. you meet a lot of people. I always work

at night, because there is too much traffic during the day. I live twenty

miles(英里)outside London and I go to work at 5:30 in the afternoon."

     "I usually go home between 2 and 3 in the morning."

     "Some very strange things happened late at night .The other day I was

taking a woman home from a party .She had her little dog with her. When

we got to her house, she found that she had lost her key. So I waited in the

car with the dog while she climbed in through the windows."

     "I waited and waited. After half an hour of ringing the bell I decided to

find out what was going on .I tied the dog to a tree and started to climb in

through the window. The next thing I knew was that the police came.

They thought I was a thief(小偷).

     Luckily the woman came downstairs(下楼).She must have gone to

sleep and forgotten about me and the dog!"

1. The driver always worked at night because it was easier to _____.

A. drive

B. make money 

C. climb in through the window

D. meet a lot of people

2. The woman climbed in through the window because _____.

A. she wanted to have a sleep

B. her husband didn't open the door for her

C. she didn't want to pay the driver

D. she couldn't find her key

3. The story happened _____.

A. early in the morning

B. late at night

C. 20 miles outside London

D. near the police station

4. Which of the following is wrong?

A. The driver worked until between 2 and 3 in the morning.

B. The police made a mistake.

C. The woman had no money to pay the driver.

D. The woman had forgotten about the driver and the dog.

5. The driver climbed in through the window to

A. get money from the woman

B. return the dog to the woman

C. see what was happening in the house

D. phone the police

单项选择题