What's the matter ___________ you?[ ]
A. with
B. of
C. at
答案：A
选择填空。
A: May I borrow your pencil case?
B: .[ ]
A Fine.
B. Sure, here you are.
C. Yes, it is.
以下哪项不属于流媒体系统中使用的传输协议。（）
A.RTP/RTCP
B.RTSP
C.SCCP
D.UDP/IP
