以下属于卫星通信特点的是（）。
A.易受到陆地灾害影响
B.可同时在多处接收
C.可靠性高
D.传输时延大
参考答案：B, C, D
— It's said a pianist will perform at Poly Theater on Friday evening. Is it Lang Lang?
— Yes, it _______ him. He _______ for a week.
A．must be; has arrived here
B．maybe; has been here
C．must be; has been here
D．maybe; has arrived here
患者，男，41岁。有“血管性头痛”史，近日头痛如针刺，以前额、眉棱骨痛为甚，舌暗，脉弦涩。治拟活血化瘀，宜选何药引经（）
A.细辛
B.柴胡
C.白芷
D.葛根
E.藁本
