网络拓扑结构主要有5种:星型拓扑结构、___________拓扑结构、_________拓扑构、_________拓扑结构和网状拓扑结构。
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计算机网络按覆盖范围可分为_________、____________和广域网。
[音频]
A. The fever has gone, but I'm still feeling weak.
B. Don't worry. Everything will be OK.
C. I know what you mean.
D. I'm having trouble breathing.
[音频]You've got a touch of flu. 你感冒了。
A. Is it serious, doctor?
B. I can't concentrate（集中注意力） in class.
C. The trouble is that I can't afford to be sick right now. 问题是我现在不能得病。
D. I have lost a lot of weight. 我已经减掉很多斤了。
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