题目内容
A．逐跳头部B．路由选择头部C．分段头部D．认证头部
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A．100msB．200μsC．125μsD．150μs
A．0．4B．0．5C．0．8D．1．0
听力原文：W: Hello, Mr. Kay？ I'm sorry for being late.
M: That's quite all right.
W: I owe you an apology. I was planning to come to your reception this evening but I'm afraid I can't make it after all. My mother's been taken iii and I have to go down to the hospital.
M: Very sorry to hear it. I hope it's nothing serious.
W: Well, they aren't sure. They've got to do some tests.
M: Well, thank you for letting me know. Let me know if there's anything I can do.
W: Thanks. Goodbye.
M: Goodbye.
(12)
A．2032B．2048C．2000D．2056
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