问题 单项选择题

在TCP/IP参考模型中,负责提供不可靠的无连接服务的协议是______。

A.FTP

B.DNS

C.UDP

D.TCP

答案

参考答案:C

解析:[知识点] TCP/IP参考模型与协议 [评析] TCP/IP参考模型中的部分协议: ①传输控制协议(TCP)是一种可靠的面向连接的协议,它允许将一台主机的字节流(Byte Stream) 无差错地传送到目的主机。 ②用户数据报协议(UDP)是一种不可靠的无连接协议,它主要用于不要求分组顺序到达的传输中,分组传输顺序的检查与排序由应用层完成。 ③文件传输协议(FTP)用于实现互联网中的交互式文件传输功能。 ④域名服务(DNS)用于实现网络设备名字到IP地址映射的网络服务。

阅读理解

The first time I saw Jim Wooten I really understood him. He was a great TV news reporter. When he was reporting in Rwanda, one heartbreaking moment made a deep impression on me. When the camera showed all of the children who were dying, suffered from terrible diseases, Jim ended his piece by saying that when he got home, the first thing he was going to do was to put his arms around his own children. Then I realized that he was different, that he didn’t fall into any of the modern television-news tricks, that he was not giving us any awful, artificial(假的) television-journalist reports out of(出于) pity. Instead, I was watching a real reporter with a gift(天赋) for both words and slight differences.

Then I read his book, We Are All the Same, about his friendship with Xolani Nkosi, a South African boy who became the international spokesman for AIDS(艾滋病). It is about the friendship between Wooten and a black child who was ten years old and already dying of AIDS. It is also a book about a great teacher and his student. But the teacher-the one with real wisdom and understanding about life-is the little boy, not the journalist. And, finally, it’s about a love story of Gail Johnson, Nkosi’s white mother who does her best to save the boy, and their love for each other. When reading the book, I felt touched from time to time.

小题1:How did Jim Wooten feel when he saw the dying children in Rwanda?

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小题2:What would an ordinary journalist do on TV when he saw these dying children?

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小题3:How did Jim end his piece when he saw the dying children in Rwanda?

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小题4:Who is the teacher in the book, the little boy or the journalist?

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小题5:Why did Nkosi’s mother do everything possible to save the boy?

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小题6:What’s the writer’s attitude to Jim Wooten? How do you know that?

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解答题