问题 单项选择题

一个功能完备的计算机网络需要指定一套复杂的协议集。对于复杂的计算机网络协议来说,最好的组织方式是_______。

A.连续地址编码模型

B.层次结构模型

C.分布式进程通信模型

D.混合结构模型

答案

参考答案:B

解析:[知识点] 计算机网络体系结构的基本概念[评析] 网络体系结构仅仅是人们对于网络功能的描述,这些功能的实现要通过具体的硬件和软件来完成。从这个意义上讲,网络体系结构由两方面组成。一方面是网络层次结构模型,另一方面是各层的协议。所以,也可以认为网络体系结构是网络层次结构模型和各层次协议的集合。

阅读理解

long ago people made fires from lightning(闪电)。 But they had to keep the fire burning, for they couldn’t start it again if there was no lightning. Later, they found out hitting two piece of stone together could make a spark (火花). The spark could fire dry leaves. In this way they could make the fire again if it went out. Then people also learned to make a fire by rubbing. They made a hole on a big piece of wood and put a smaller stick into the hole. They turned the stick again and again. After a few minutes they got a fire.

As years went by, people learned other ways to make a fire. Sometimes they used the heat from sun. they held a piece of glass in the right way and made a piece of paper on fire.

About two centuries ago, people began to make matches (火柴). Matches brought people a quick and easy way to make fire. Today matches are still being used, but people have more new ways to make fires. One of them is to use an electric fire starter. Of course an electric fire starter is much more expensive than a box of matches. But it is more useful.

小题1: A spark can _________.

A.fire any leaves

B.burn anything

C.burn dry leaves

D.keep fires burning小题2: We can also get a fire by _________.

A.making a hole on a big piece of wood

B.putting a smaller stick into the hole

C.turning the stick hard for a while

D.doing all the above together小题3: Matches have been used _________.

A.for about two thousand years

B.for about two hundred years

C.since people began to use fire for cooking

D.since people used the heat from the sun.小题4:From this passage we know _______.

A.using matches is the easiest and most useful way to make fires

B.people don’t use matches any more since they had electric fire starters

C.today there are only two ways to make fires

D.some forest fires happen from lightning小题5: Choose the right order of the ways to make fires people got to know _________.

a. with a match

b. from the sun

c. from lightning

d. by rubbing

e. with an electric fire starter.

A.d ,b, c, a, e

B.d, c, b, a, e

C.c, d, b, a, e

D.c, b, d, a, e

多项选择题