题目内容：
随意安排甲、乙、丙3人在3天节日中值班一天，那么甲排在乙之前的概率是
A．1/6 B．1/2
C．1/3
D．1/4
参考答案：
答案解析：
单选题：随意安排甲、乙、丙3人在3天节日中值班一天，那么甲排在乙之前的概率是
- 题目分类：文科数学
- 题目类型：单选题
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B．1/2
C．1/3
D．1/4
B．1/2
C．1/3
D．1/4
已知双曲线上一点到两焦点(-5，0)，(5，0)距离之差的绝对值等于6，则双曲线方程为
已知双曲线上一点到两焦点(-5，0)，(5，0)距离之差的绝对值等于6，则双曲线方程为 A． B． C． D．
Which of the following is NOT true? ( )
Which of the following is NOT true? ( ) A．"Sir" and "Madam" are used more often
任选一个两位数，它恰好是10的倍数的概率是
任选一个两位数，它恰好是10的倍数的概率是 A．2/9 B．1/9 C．1/10 D．1/5
() With tears on her face, the old lady watched the little
() With tears on her face, the old lady watched the little boy__________to a ho
( )They didn't tell me__________go for their holiday.
( )They didn't tell me__________go for their holiday. A．where will they B．where