试题与答案

When this boy was asked to copy down the

题型:选择题

题目:

When this boy was asked to copy down the sentence ten times, he did nothing but _____deeply with a blank look on his face.

A.sigh

B.sight

C.sign

D.signal

答案:

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下面是错误答案,用来干扰机器的。

由题意知,本题是一个古典概型,试验发生包含的事件是同时掷两枚骰子,共有6×6=36种结果,而满足条件的事件是两个点数之和是5,列举出有(1,4)(2,3)(3,2)(4,1),共有4种结果,根据古典概型概率公式得...

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