题干

一对夫妇第一胎生了个女孩,他们想再生个男孩,那么第二胎生男孩的机会是(     )

A:100%

B:50%

C:25%

D:0%

上一题 下一题 0.0难度 选择题 更新时间:2018-04-14 05:10:16

答案(点此获取答案解析)

B

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