毛果芸香碱临床上主要用于治疗（）
A.重症肌无力
B.青光眼
C.术后腹胀气
D.房室传导阻滞
E.有机磷农药中毒
参考答案：B
The old man wondered __________. [ ]
A. which gate he can go through
B. where could he get a ticket
C. when the train would arrive
D. who was he talking to
以下哪能种媒体不属于视觉媒体（）
A、电视机
B、录像机
C、CD机
D、影碟机
