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问题 单项选择题

下列选项中，使用子网编址的网络中，路由表要包含的信息是( )。

A．子网屏蔽码

B．源主机的IP地址

C．数据报已经经过的历史路由器IP地址

D．到目的网络路径上的所有路由器的IP地址

答案

参考答案：A

解析： 在使用子网编址的网络中，子网屏蔽码需要扩充入路由表，因为只有子网屏蔽码同目的IP地址进行逻辑“与”操作，才能得到目的子网的网络地址。

单项选择题

对于同一种土的动力特性参数动模量和阻尼比来说，下列叙述正确的是( )。

A．随着动应变的增加，动模量和阻尼比的数值一般都会增大

B．随着动应变的增加，动模量一般会增大，而阻尼比的数值一般会减小

C．随着动应变的增加，阻尼比一般会增大，而动模量的数值一般会减小

D．动模量和阻尼比的数值大小与动应变没有直接关系
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单项选择题

Jack’s friend Tony had recently gotten a tattoo (纹身), and Jack was so impressed by Tony’s bravery and his tattoo that he decided to get one too. Why do a lot of young people in North America get tattoos today Peer pressure, media influence, and personal expression are some of the common reasons.
The desire to be part of a group, to be accepted by one’s friends or peers, can have a great influence on what a person does. Sometimes, wearing a tattoo can be a sign that you belong to a certain group. Gangs often use special clothes and tattoos to identify their particular group. For example, in one gang all the members may wear green army jackets and have large "Xs" tattooed on their arms. It is not only gangs that have this type of special "uniform". Young people often belong to a certain group of friends. Some of these groups wear only brand-name clothes. Others wear tattoos. When a person’s friends are all doing something, such as getting a tattoo, that person is more likely to do the same thing, and get a tattoo too.
The media is another big influence behind the popularity of tattoos in North America. A wide variety of media images show tattoos. Tattoos can be seen on people appearing in commercials selling expensive cars. Famous sports heroes with tattoos are shown in magazines. Fashion models are often seen in magazines and on TV wearing designer clothes that show their bodies tattooed with detailed and colorful patterns. These media images link tattoos to ideas of wealth, success, and status. As a result, many people decide to get a tattoo for its fashion and status value.
It is not always the influence of other people or the media that results in a person getting a tattoo. Many people decide to wear tattoos in order to express their artistic nature, their beliefs, or their feelings -- in other words, to show their individuality. A musician in a rock band may get a tattoo of a guitar on the arm. Some environmentalists may tattoo pictures of endangered animals on their shoulders. Lovers may tattoo each others’ names over their hearts. A tattoo can be a public sign to show what is important in a person’s life.

The best title for this passage is ______.

A. Tattoos Tell Who You Are
B. Tattoos’ New Trend
C. The Popularity of Tattoos
D. Why People Get Tattoos
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