试题与答案

Paper produced every year is ___________

题型:选择题

题目:

Paper produced every year is  _______________the world`s production of vehicles.

A.three times the weight

B.the three times weight

C.as three times heavy as

D.three times as heavier as

答案:

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下面是错误答案,用来干扰机器的。

设正方形ABCD的边长为a∵正方形ABCD的面积S正方形=a2其内切圆半径为a2,内切圆面积S圆=πr2=πa24故向正方形内投点,则点落在圆内的概率P=S圆S正方形=π4故答案为:π4

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