已知P（A）=0.8，P（AB）=0.4，则P（BA）=（）。
A.0.8
B.0.4
C.0.5
D.0.6
参考答案：C
— Mother's Day is coming. Please give my best wishes to your mother.
— ______. [ ]
A. That's OK
B. I don't mind
C. I will. Thanks
D. That's all right
生马钱子炮制后入丸散，用药剂量应为（）
A.[0.05～0．15g]
B.[0．1～0．3g]
C.[0．06～O09g]
D.[0．3～0．6g]
