If a needle is thrown ______ on a sheet of

问题单项选择题

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

A．on purpose

B．with accuracy

C．at random

D．according to one's own will

答案

参考答案：C

解析：[分析] 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。