试题与答案

32位的IP地址可以划分为网络号,主机号两部分。以下地址标记中用0表示所有比特为0,

题型:单项选择题

题目:

32位的IP地址可以划分为网络号,主机号两部分。以下地址标记中用0表示所有比特为0,用-1表示所有比特为1。其中 (41) 不能作为目标地址; (42) 不能作为源地址; (43) 不能出现在主机之外; (44) 不能出现在本地网之外; (45) 在Ipv4中不用,保留供以后使用。

A.

    B.{0,0}

    C.{127,主机号}

    D.{10,主机号}

    E.

  • D.{网络号,-1

答案:

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题型:阅读理解

阅读理解。

     Nasreddin was cutting a branch off a tree in his garden. While he was sawing, another man passed in the

street. He stopped and said, "Excuse me, but if you continue to see that brancd like that, you will fall down

with it." He said this because Nasreddin was sitting on the branch and cutting it at a place between himself and

the trunk of the tree.

  Nasreddin said nothing. He thought, "This is some foolish person who has no work to do and goes about

telling other people what to do and what not to do."

   The man continued on his way. Of course, after a few minutes. The branch fell and Nasreddin fell with it.

   "My God!" he cried. "That man knows the future !" and he ran after him to ask how long he was going to

live. But the man had gone.

1.One day Nasreddin was cutting a branch ______ a tree in his garden. [ ]

A.on

B.in

C.at

D.off

2.While Nasreddin was sawing, another man ______. [ ]

A.told him to stop working

B.told him he would fall down

C.would borrow something from him

D.would help him saw that branch

3.After the man went away, Nasreddin thought that ______. [ ]

A.that was a silly fellow

B.that was a wise person

C.that was a proud person

D.that fellow cheated him

4.What happened to Nasreddin after a few minutes? [ ]

A.The brancd fell.

B.Nasreddin fell down to the ground.

C.Nasreddin was hurt himself.

D.Both A and B.

5.This story is about ______. [ ]

A.a foolish man

B.a wise man

C.cutting a tree

D.the necessity of taking good advice

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