题目

阅读理解As your teacher passes out the math test, your hands turn sweaty. Your heartbegins to race. Glancing down at the page, you suddenly forget those operationson which you drilled only a few days earlier. What's the multiplication table? Oh,you know it—well you're pretty sure, right? Suddenly, you start to doubt a lot ofthings that you know.If that sounds familiar, you might suffer from math anxiety. Or maybe not.Even researchers who study this condition note that it can be surprisingly hardto define(下定义) mathanxiety. It's also hard to identify precisely how many people suffer 12．掷一枚点数分别为1，2，3，4的正四面体两次，求两次正四面体着地一面上的点数之和为6的概率．