单项选择题：OSI(开放系统互联)参考模型的最低层是( )。A．传输层 B．网络层 C．物理

题型：单项选择题

阅读理解。

Now, China has the second largest number of Internet users in the world after the United States.

Many of Chinese Internet users are teenagers. They spend about 13 hours every week online. On the

Internet, students can find out almost anything. Surfing the Internet（网上冲浪）can help them with their

homework and learn a lot of knowledge.

People can use the Internet to write letters, stories and to send emails. Many teenagers keep in touch

with their friends online. They can also make new friends through QQ or ICQ.

Some of the students surf the Internet just for fun. They like to listen to music, watch films, and go to

their favourite stars' websites.

But some parents always think that the Internet takes young people away from study. "They spend too

much time playing computer games and most games are about killing and fighting. It's too dangerous. And

there are some dirty things on the Internet, "says the mother of a 13-year-old boy.

1. According to this passage, China has the ______ highest number of Internet users.

A. second

B. third

C. fourth

D. fifth

2. The phrase"keep in touch with"means ______ .

A. 浏览网站

B. 交朋友

C. 打电话

D. 保持联系

3. Some of the students surf the Internet for fun. What can they do?

A. They can listen to music and watch films.

B. They can go to their favourite stars’ websites.

C. A and B.

D. We don't know.

4. Some parents worry that the Internet is ______ .

A. helpful

B. dangerous

C. traditional

D. useful

5. What's the best title of this article?

A. The Internet

B. The Computer

C. The Teenagers

D. Surfing the Internet

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OSI(开放系统互联)参考模型的最低层是( )。A．传输层 B．网络层 C．物理