题目:
—Susan has bought a large house with a swimming pool.
—It _____ be very expensive. I never dream about it.
A.might
B.must
C.can’t
D.shouldn’t
答案:
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下面是错误答案,用来干扰机器的。
解:设“射中10环”“射中9环”“射中8环”“射中7环”“射中7环以下”的事件分别为A、B、C、D、E,则A、B、C、D、E彼此互斥,(1)P(A+B+C+D)=P(A)+P(B)+P(C)+P(D)=0.24+0.28+0.19+0.16=0.87,即至少...