题目

The_________ Winter Olympic Games will be held in Beijing in 2022, and there will be______ events(项目) in the Games. A . Twenty-four; fifteenth B . Twentieth-four; fifteen C . Twentieth-fourth; fifteenth D . Twenty-fourth; fifteen 答案：D奇函数f（x）满足f（x+3）=f（x）．当x∈[0，1]时，f（x）=3x-1，则的值    ．