参加室间质控活动中，求取均值的样本数不能少于多少个（）。
A.10
B.50
C.100
D.150
E.200
参考答案：A
—He didn't stay up late last night.
— ________. [ ]
A. So did I
B. So didn't I
C. Neither did I
D. Neither didn't I
药物在人体内的代谢器官主要为
A．肾脏
B．肝脏
C．脾脏
D．肺
E．心脏
