If a needle is thrown______on a sheet of paper ruled with lines, how often can it be expected to fall on a line?

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问题 If a needle is thrown______on a sheet of paper ruled with lines, how often can it be expected to fall on a line?

选项 A、on purpose
B、with accuracy
C、at random
D、according to one’s own will

答案C

解析 习语搭配A.on purpose故意;B.with accuracy正确地;C.at random随意地;D.according to one’s own will按照某人自己的意愿;而本句意为:如果把一个针——扔在一张用尺子画上许多条线的纸上,那么这个针正落在一条线上的机率是多大?既然是问概率,那么应是随机地去做某事;因此答案应为C。
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