单项选择题

请按顺序说出 802.1d 中端口由阻塞到转发状态变化的顺序（）。（1）listening （2）learning （3）blocking （4）forwarding
A、4-1-2-3
B、3-2-4-1
C、4-2-1-3
D、3-1-2-4

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First of al, on behalf of all the people from our company, I would like to say “Thank you for ____(20)us to such a wonderful party.” I think the music is _(21), the food and wine are very nice, and the people here are very kind. Also we’ve enjoyed meeting and (22)you, sharing the comfortable time together. We have really enjoyed ourselves. I hope we will be able to maintain the (23) and make next year another great one together. Thank you again for the party! We’ve really had ___(24).

答案： (1)
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单项选择题

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A．对
B．错