问题 单项选择题

R1、R2是一个自治系统中采用RIP路由协议的两个相邻路由器,R1路由表如表2-1所示。当R1收到R2发送的如表2.2所示的(V,D)报文后,R1更新的4个路由表项中距离值从上到下依次为()。

A.0,4,2,3 

B.0,4,3,3 

C.0,5,3,3 

D.0,5,3,4

答案

参考答案:C

解析:

根据当R1收到R2发送的如图(b)的(V,D) 报文后,R1更新的四个路由表中有距离值为0、4、4、3可以看出,C选项中,由R3到达目的地址30.0.0.0的距离为4,接收到的(V,D) 数值为3,因此原来R3到目的地址30.0.0.0的距离为3或者大于3,故选项C不可能。

阅读理解

根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项多余选项。

Marriage is one of the most important experiences of a person’s life, but like any legal process, it can get complicated. In this article, we’ll look at some of the laws in the USA surrounding marriage, including age requirements and marriage licenses. We’ll also explore some of the many legal benefits of being married.

______小题1:_______ Depending on where you live, there are rules governing who can get married and how a marriage license can be obtained.

Each state has its own laws regarding the age requirements to receive a license. _____小题2:____ In most states, both parties must be 18 years old in order to marry without their parents’ permission. However, in some states, with the parents’ permission, people as young as 12 years old can marry.

In order to have a legally-recognized marriage, a couple has to have a valid marriage license. ______小题3:______ The couple fills out an official application and then there’s a short waiting period, maybe a couple of hours or a few days before the license is issued. Usually when applying for a marriage license, official identification is required. _______小题4:_______ After a couple gets married, a marriage certificate is proof that a marriage has taken place.

_______小题5:_______ Many of them are also offered by private employers --- such as days-off for the birth of a child and family health insurance plans. Social scientists have also found many positive benefits for married couples and families, including fewer incidents of poverty and mental health problems.

A.The legal age to marry varies from state to state.

B.Some couples also have an agreement before getting married.

C.It can be a birth certificate or an ID card.

D.Different states have different laws in terms of marriage.E. An application must be filled out in order to get a marriage license.

F. When applying for a marriage license the couple must appear together.

G.  Besides love and companionship, there are many benefits of marriage.

单项选择题