问题 单项选择题

在IP数据报报头中有两个表示长度的域,一个为报头长度,一个为总长度。其中

A.两者都以8位字节为计数单位

B.两者都以32位双字为计数单位

C.前者以8位字节为计数单位,后者以32位双字为计数单位

D.前者以32位双字为计数单位,后者以8位字节为计数单位

答案

参考答案:D

解析: 在IP数据报报头中有两个有关长度的字段,一个为报头长度字段,一个为总长度字段。其中报头长度以 32位双字为单位,指出报头长度;总长度以8位字节为单位,指出整个IP数据报的长度。

阅读理解

What will you do if you have six million dollars? Different people give different answers.

David  I will buy an island if I have six million dollars. Then I will be the king of the island. I will invite my friends to my island and we’ll have a good time there.

Cathy  If I get six million dollars, I want to start my own business and I will do a lot of things for my family. For me, nothing is more important than my family. I will buy a new house for my parents and take them to travel around the world.

Julie   If I have six million dollars, I will put five million in the bank and spend one million. I will visit Sydney, Toronto, Moscow and other interesting cities. I want to try different kinds of delicious food, and build a house with a swimming pool.

Victor  If I have six million dollars, I will use the money to do everything I like. I will use two million to open my own shop. And I will give another four million to schools and charities. I would like to help students in poor areas to get good education. I want everyone to live a happy life.

小题1:David will invite his friends to ________.

A.his new house

B.his island

C.his country

D.his factory小题2: _________ will take his (her) parents to travel around the world.

A.Victor

B.Julie

C.David

D.Cathy小题3:Julie will spend _________ million dollars traveling and doing other thing.

A.one

B.two

C.three

D.four小题4:Victor will spend two million dollars _________.

A.enjoying delicious food

B.helping poor students

C.opening a shop

D.building a house小题5:Which of the following is NOT true according to this passage?

A.Victor hopes everyone can live a happy life.

B.Julie doesn’t like traveling.

C.Cathy loves her family very much.

D.David gets on well with his friends.

单项选择题 B1型题