问题 单项选择题

MPLS是一种将______路由结合起来的集成宽带网络技术。

A.第一层转发和第二层
B.第二层转发和第三层
C.第三层转发和第四层
D.第四层转发和第七层

答案

参考答案:B

解析: 多协议标签交换(MPLS)是一种用于快速数据包交换和路由的体系,它为网络数据流量提供了目标、路由、转发和交换等能力。MPLS标记位于第二层和第三层之间。MPLS帧的转发是在数据链路层由硬件完成的,而不是在网络层根据IP地址由软件完成的,因此其转发速度快。

阅读理解

阅读理解。

    The most common unlucky number is thirteen. People don't like to live in a house that is number

thirteen. People don't like to have parties with thirteen people. People don't like to do important things

on the thirteenth of the month. Also, when you add the Japanese unlucky numbers together-nine and

four-they make thirteen.

    One English teacher told his students a story about "thirteen". The classroom was number thirteen.

At the end of the lesson one of the students changed the number of the room to 12A. In the afternoon,

another teacher wanted to find Room 13. He didn't know about the changed numbers. He walked around

the school for half an hour. At last, someone told him about the changed number-that Room 12A was

Room 13.

    There aren't many business meetings on the thirteenth of the month especially when the thirteenth is

on a Friday. Friday is always unlucky. Adam and Eve left the Garden of Eden on a Friday. Jesus Christ

died on a Friday. (There were thirteen people at His Last Supper.) In Europe, they killed criminals on

Friday.

     For some people, unlucky numbers do the opposite things. My elder brother was born on the thirteenth.

He passed his exams on the thirteenth. He married on the thirteenth. He became a pilot on the thirteenth.

It was always a lucky day for him.

1. From the text we know that ___. [ ]

A.nobody likes the number four or nine

B.people never have business meetings on the thirteenth

C.thirteen is not liked by many people

D.thirteen is unlucky only in Europe

2. In Europe people think Friday is always unlucky possibly because ___. [ ]

A.Jesus Christ died on Friday

B.some criminals are killed on Friday

C.more people died on Friday

D.there is a thirteenth on one Friday

3. What's the writer's attitude towards the unlucky numbers? [ ]

A.He doesn't mention it.

B.He thinks four and nine are unlucky numbers.

C.He thinks thirteen is lucky for him.

D.He doesn't like thirteen, either.

选择题