治疗中风中脏腑元气衰脱，心神散乱证，应首选
A．安宫牛黄丸B．参附汤C．苏合香丸D．清开灵(静脉滴注)E．安神丸
参考答案：B
—Do you know _____ that Mr. White left the party without saying a word last night?
—Perhaps because he was angry with Alan’s rude remarks.
A．why was it
B．how was it
C．how it was
D．why it was
在社会经济统计中加权调和平均数看成是加权算术平均数的（）。
