题目

—Which season do you like _____ in Changsha, spring or summer? —Summer. Because it's hot and I can't stand it. A . more B . most C . less 答案：C已知函数y=(x-1)2-1(x≤3)(x-5)2-1(x＞3)，则使y=k成立的x值恰好有四个，则k的取值为 ．