问题 多项选择题

两台MSR路由器MSR-1、MSR-2通过广域网连接并通过RIPv2动态完成了远端路由学习。稳定了2分钟后,在MSR-1上接收到来自MSR-2的RIP更新报文,其中含有Cost为14的路由,那么()。

A.如果MSR-1的路由表原本没有该路由,那么该路由一定会被加入MSR-1路由表

B.如果MSR-1的路由表原本有该路由,而且其Cost小于14,那么在MSR-1上该路由项不会更新

C.如果MSR-1的路由表原本有该路由,仅当其Cost大于14时,该路由项才会被更新

D.如果MSR-1的路由表中原本有从该邻居收到的相同路由,且其Cost小于14,该路由也会被更新

答案

参考答案:A, D

阅读理解

阅读理解。

     A meteorite (陨石) almost hit an 80-year-old man named Arthur Pettifer in Britain when he was

 working in his garden. The meteorite was the biggest in the past 26 years in Britain.

 The meteorite weighed (重量) one kilo, and might be over four thousand million (百万) years old.

 "I hear the big noise in the air. I looked up and saw the tops of the trees coming and going," he said.

 "I didn't know what it was."

 Meteorites are small things from the small planets in space. About 3,500 meteorites may fall on earth

  every year, but only very few are found. Mr. Pettifer's meteorite is the fifth to fall in Britain since the

 Second World War.

 Mr. Pettifer is glad. "When you think about it coming from so far away, it really is something strange."

1. The meteorite was _____ Mr Pettifer when it fell down.

    A. close to

    B. far from

    C. hitting

    D. coming to

2. The meteorite was already _____ years old.

    A. 40,000,000,000 

    B. 40,000,000

    C. 400,000,000 

     D. 4,000,000,000

3. Mr. Pettifer found the tops of the trees coming and going because _____.

    A. the trees were afraid

    B. the fast falling meteorite kept the tree tops moving

C. it was going to rain

    D. the moving was made by wind

4. _____ people see a meteorite fall although they visit the earth often each year.

    A. Quite a few 

    B. Some 

    C. Few 

    D. Many

5. Mr. Pettifer was _____ to see the falling of the meteorite.

    A. happy 

    B. afraid 

    C. sorry 

    D. angry

单项选择题