（）是专门为铁路设计的专业无线数字通信系统。
A.GSM-R
B.TCC
C.RBC
D.CTC
参考答案：A
膀胱癌见于
A．肾结石B．肾结核C．肾肿瘤D．肾下垂E．肾水肿
—Could you tell me _____?
—Glad to help. [ ]
A. if I have been to the Great Wall
B. where did he study
C. how I can get to the station
D. what's your name
