题目

已知函数y=的最大值为M,最小值为m,则的值为       （    ） A．    B．    C．       D． 答案：C--- Would you like to go to the concert with me?  --- I’d love to. But I’m a little tired. I prefer      at home rather than         out. A．staying,going B．to stay,to go C．to stay, go D．staying, to go