题目

--What a hot day! How about going swimming after school? --         ! Let's ask Daniel to go with us． A．That's OK            B．No problem             C．Good luck            D．Sounds great 答案：D若A与B是互斥事件，其发生的概率分别为p1，p2，则A、B同时发生的概率为A.p1+p2B.p1•p2C.1-p1•p2D.0