题目

What does the man think of his job?A.Disappointed. B.Pretty good. C.Satisfied. 答案：【答案】A【解析】【原文】W: How do you like your new job?M: Actually, I'm thinking about changing my job.W: Why? You did pretty good.M: But I'm not very satisfied with my salary.如果偶函数f（x）在R上可导，且是周期为T=3的周期函数，且f′（1）=0，则方程f′（x）=0在区间[0，6]上的实根个数至少是（ ）A．11B．9C．7D．5