问题 单项选择题

ICMP属于TCP/IP协议中的()。

A.数据链路层

B.网络层

C.传输层

D.应用层

答案

参考答案:B

解析:

[分析]:本题考查TCP/IP的基础知识。

TCP/IP协议自底向上分为4层:分别是数据链路层、网络层、传输层和应用层。数据链路层提供了TCP/IP与各种物理网络的接口,把IP数据报封装成能在网络中传输的数据帧,为数据报的传送和校验提供了可能。网络层的功能主要体现在IP和ICMP协议上。IP协议负责Internet上网络与网络之间的通信,规定了Internet上的计算机之间通信所必须遵循的规则。ICMP协议是IP的延伸和IP不可分割的组成部分。它使用IP数据报传输设施来发送报文,并具有传输控制、出错报告和其他的检查功能。

阅读理解

阅读理解。

     People at home keep asking me, "Is it hard to learn Chinese? Why have you learned it so well?" Well,

there's one thing that makes Chinese easy to learn: there are so many people to talk to. You've probably

heard that it's the most spoken language. Today it's also one of the most written languages online. And

with so many Chinese people interested in learning English, it couldn't be easier to find a friend for language

learning. You just have to know where to look for them.

     The really good place to look for them is QQ. QQ has the same status (地位) in China as AIM (AOL

Instant Messenger) does in the US. It is reported that at any moment, up to 9,000,000 people are using

QQ. They're at work, or in a web café (网吧), or at home, and the information of the users can be found.

If you sign on with your address set to"abroad", you'll soon find that many thousands of them are interested

in speaking to you! This is a great way for you to learn Chinese, and for them to learn English. I think that

it's a very interesting way of cultural contact (文化交流), too, for ordinary people from around the world

to be able to have one-on-one contact.

1. In the first paragraph (段落), the writer tells us _____.

A. why his family members want to learn Chinese

B. where you can find people to talk to for language learning

C. the easiest thing to do is learning Chinese

D. Chinese isn't so hard to learn as his friends think

2. From the second paragraph we know that QQ and AIM are _____.

A. addresses for the Internet users

B. documents you need to get online

C. tools for people to talk online

D. programmes of a computer 63. Offices, web cafes and homes _____.

A. attract the most people to learn Chinese

B. provide both QQ and AIM in China

C. are the best places for English learners

D. have the most people online

4. The writer wrote this passage mainly to _____.

A. tell a way of learning Chinese

B. show what the Chinese people are doing

C. tell the important of learning Chinese

D. show the difference between AIM and QQ

5. The writer of this passage is probably _____.

A. a Chinese who works abroad

B. an expert who works at home

C. an American who works in China

D. a salesman who sells softwares

单项选择题