从目前的应用需求来看，下面（）不是全球多媒体网络必须具备的特性。

FDDI与Token Ring的MAC帧格式较为相似，分为两种（）。

A.控制帧和数据帧
B.令牌帧和信息帧
C.令牌帧和数据帧
D.控制帧和信息帧

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听力原文：M: Can you buy ale some stamps and envelopes while you are in the post office?W: I don't intend to stop by the post office, but I will go to the grocery store and to the cleaners after I see the doctor.Q: Where will the woman go first?(17)A．The post office.B．The grocery stove.C．The doctor's office.D．The cleaners.

A.
Q:
B.The
C.
B．The
D.
C．The
E.
D．The
F.

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