问题 单项选择题

下列对于计算机网络拓扑的描述中,错误的是( )。

A.计算机网络拓扑是通过网中结点与通信线路之间的几何关系表示网络结构

B.计算机网络拓扑结构对网络性能和系统可靠性有重大影响

C.计算机网络拓扑主要指的是资源子网的拓扑构型

D.计算机网络拓扑结构反映出网络中各实体间的结构关系

答案

参考答案:C

解析: 选项A),计算机网络拓扑是通过网中结点与通信线路之间的几何关系表示网络结构;选项B),网络拓扑设计是建设计算机网络的第一步,也是实现各种网络协议的基础,拓扑结构对网络性能和系统可靠性有重大影响;选项C),计算机网络拓扑主要指的是通信予网的拓扑构型;选项D),计算机网络拓扑结构反映出网络中各实体间的结构关系。

阅读理解

Soon computers and other machines will be able to remember you by looking at your eyes! The program works because everyone’s eyes are different. So in the future you won’t have to remember a number when you want to use a machine or take money out of a bank. You’ll just have to look at the machine and it will be able to tell who you are.

The eye-recognition(眼睛识别 program has already been tested in shops and banks in the USA, Britain, Spain, Italy and Turkey. Soon this technology(技术) will take the place of all other ways of finding out who people are.

However, scientists are also working on other systems. Machines will soon be able to know you from the shape of your face or hand or even your smell! We already have machines that can tell who you are from your voice or the mark made by your finger.

Eye-recognition is better than other kinds because your eyes don’t change as you get older, and don’t get dirty like hands or fingers, and even twins have different eyes. So the eye-recognition program can be up to 94% correct, depending on how good the technology is. However, some other programs may only be 51% correct at present. In Britain, it was found that 91% of people who had tried it said that they liked the idea of eye-recognition.

In the future your computer will be looking you in the eye. So smile!

小题1:Where has the eye-recognition program already been tested in a few countries? In_______.

A.shops and banks

B.shops and schools

C.banks and schools

D.schools and hospitals小题2: How does the eye-recognition program work?

A.You look at the machine and type a number.

B.You need to speak and then look.

C.The machine looks at your face.

D.You look at the machine.小题3: We already have machines that can tell who you are from ________.

A.your eyes or your smell

B.your voice or the mark made by your finger

C.your face or your voice

D.your face or your hand小题4: Which of the following doesn’t belong to the advantages of the eye-recognition program?

A.Your eyes don’t change as you get older.

B.Eyes don’t get dirty like hands or fingers.

C.Everyone’s eyes are different, even twins have different eyes.

D.We can’t see anything without eyes.小题5: What problem could there be with the eye-recognition program?

A.Some eyes are the same.

B.Eyes can change.

C.It is not always correct.

D.Eyes can get dirty like hands.

选择题