问题 单项选择题

属于网络202.115.200.0/21的地址是()。

A.202.115.198.0

B.202.115.206.0

C.202.115.217.0

D.202.115.224.0

答案

参考答案:B

解析:

在IP地址202.115.200.0/21中,“/21”表示该IP地址块的网络号和子网号长度为21位,其对应的子网掩码二进制表示为1111 1111.1111 1111.1111 1000.0000 0000,即255.255.248.0。 网络地址202.115.200.0的第3字节“200”的二进制表示为1100 1000,其中阴影部分为被子网掩码比特“1”所覆盖的范围。由此可知,该子网的地址范围为202.115.200.0~202.115.207.255,即地址202.115.206.0属于网络202.115.200.0/21的IP地址。

阅读理解

In England recently three foreign gentlemen came to a bus stop and waited. About five minutes later, the bus they wanted came along. They were just going to get on when suddenly there was a loud noise behind them. People rushed onto the bus and tried to push them out of the way. Someone shouted at them. The bus conductor came rushing down the stairs to see what all the trouble was about. The three foreigners seem all at sea and looked embarrassed. No one had told them about the British custom of lining up for a bus that the first person who arrives at the bus stop is the first person to get on the bus.

Learning the language of a country isn't enough. If you want to have a pleasant visit, find out as much as possible about the manners and customs of your host country. You will probably be surprised just how different they can be from your own. A visitor to India would do well to remember that people there consider it impolite to use the left hand for passing food at table. The left hand is supposed to be used for washing yourself. Also in India, you might see a man shaking his head at another to show that he doesn't agree. But in many parts of India a shake of the head means agreement. Nodding (点头) your head when you are given a drink in Bulgaria will most probably leave you thirsty.

The British people tried to push the three gentlemen out of the way, because the gentlemen _______ .

A. were foreigners                   B. didn't have tickets

C. made a loud noise              D. didn't line up for the bus

According to the article, if you want to have a pleasant journey in a foreign country, you should ________.

A. learn the language of the country

B. understand the manners and customs of the country

C. have enough time and money

D. make friends with the people there

In India it is considered impolite ________.

A. to use the right hand for passing food at table.

B. to pass food with the left hand.

C. to eat food with your hands.

D. to help yourself at table.

The best title (题目) for this article is ________.

A. People's Everyday Life

B. Mind Your Manners

C. Shaking and Nodding Head 

D. Taking a Bus in England       

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