问题 单项选择题

关于1Gbps Gigabit Ethernet,下列说法不正确的是( )。

A.用介质独立接口(MI 将MAC子层与物理层分隔

B.IEEE 802.3z是Gigabit Ethernet的标准

C.与传统的10Mbps以太网具有相同的组网方法

D.每个比特发送速率由10Mbps的100ns降低到1ns

答案

参考答案:A

解析: 采用的是千兆介质专用接口(GMII)。100Mbps Fast Ethernet采用MII隔离MAC子层与物理层。

阅读理解

阅读理解。

     We know music is very important in our daily life. Do you notice music playing at any of those

places when you go somewhere? Today most stores, stations, restaurants and other places play music.

You might even hear music in an office or in a farm.

     Scientists believe that music influences the way people behave. They think that the sound of western

classical(古典) music makes people feel richer. When a restaurant plays classical music, people spend

more money on food and drinks. When the restaurant plays modern music, people spend less money.

Without music, people spend even less.

     Scientists also believe that loud, fast music makes people eat faster. Some restaurants play fast music

during their hours. This makes people eat faster and leave quickly. Restaurants can make more money

in this way.

     Some scientists think that music makes you think and learn better. They say that music helps students

to be more active. It is true that people learn better when they are relaxed. And listening to music can

help you relax.

     The next time you hear music somewhere, be careful, It might influence the way you do things.

1. According to the text, scientists believe that music can ________.

A. create different feeling for us    

B. help us to develop good habits

C. develop our interest in money    

D. influence natural environments

2. Western classical music is often considered to be ________.

A. a sign of being slower            

B. something about manners

C. a sign of being richer            

D. something with new styles

3. Which type of music below can make people work faster?

A. Light music.  

B. Rock music.    

C. Sweet music.  

D. Soft music.

4. The habit of listening to music can make a student ________.

A. slow in action  

B. care about manners 

C. fresh in mind  

D.  worry about studies

5. Which of the following can be the best title of the passage?

A. Music in Restaurants          

B. Good and Bad Music  

C. Types of Music                

D. Music and Behavior

单项选择题 A3/A4型题