题目

An individual human existence should be like a river-small at first, narrowly contained within its banks, and_____ passionately past rocks and over waterfalls. A．to rush        B．rushing          C．rushed       D．rush 答案：B一个分数的分子是互为倒数的两个数的积，分母是最小的合数，这个数是．(分数，先填分子，后填分母)