根据短文内容，从短文后的七个选项中选出能填入空白处的最佳选项。选项中有两项
为多余选项。
__ 71 __ From 18－25, according to I.Q. scores；but you are wiser and more experienced with increasing age.
You are smartest in your 20's; around 30, your memory begins to go down, particularly your ability to perform mathematical computations. __ 72 __ Your vocabulary at the age of 45, for example, is three times as great as when you graduated from college. At 60, your brain possesses almost four times as much information as it did at the age of 21.
