在局域网的拓扑结构中，只允许数据在传输媒体中单向流动的拓扑结_爱下问搜题

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问题单项选择题

在局域网的拓扑结构中，只允许数据在传输媒体中单向流动的拓扑结构是( )。

A．星形拓扑

B．总线型拓扑

C．环形拓扑

D．树形拓扑

答案

参考答案：C

解析：环形拓扑结构中，结点通过相应的网卡，使用点对点连接线路，构成闭合的环形。环中数据沿着一个方向绕环逐站传输。

选择题

从八边形的一个顶点引它的对角线,可将八边形分成( )个三角形．[ ]

A．5

B．6

C．7

D．8

补全对话，情景问答

从A－G选项中选出能填入空白处的最佳选项补全对话。（选项中有两项是多余的）

A. Maybe you're right.
B. Is there anything wrong?
C. I'll try to understand her.
D. She nags me about almost everything.
E. That's a good idea.
F. But she doesn't like it at all.
G. Could I use your telephone, please?

A: Hello, Xiao Hong!
B: Hello!
A: You look a little upset. 1______.
B: Yes. It's just my mom. She always nags (唠叨) me.
A: Really? What does your mother nag you about?
B: 2______ " Get up now... Everything must be in place... Don't forget your piano lesson..."
A: Well, all the mothers like saying these words to their children.
B: Also, I'm fond of pop music. 3______ We don't have the same interest in many things.
A: 4______ But I should say she nags you because she cares about you.
You're lucky to have such a good mother.
B: I agree with you. 5______.
A: That's right. Understanding is important. If your mom knows that everything is fine,
she will never nag.