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听力原文：Woman: Of course, I was looking forward to it. I mean, it meant seeing the results of quite a lengthy process to find the right person, which I myself had invested quite a lot of time in. It's a demanding post, with a lot of responsibility. I think the new manager's going to deliver that sort of (19)
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【单选题】设 A , B 为随机事件,且 P ( A )>0 , P ( B )>0 ,则由 A 与 B 相互独立不能推出
A.
P ( A + B )= P ( A )+ P ( B )
B.
P ( A | B )= P ( A )
C.