设函数f（x）的定义域为R．若存在与x无关的正常数M，使|f（x）|≤M|x|对一切实数x均成立，则称f（x）为有界泛函．在函数：

①f（x）=-3x，

②f（x）=x²，

③f（x）=sin²x，

④f（x）=2^x，

⑤f（x）=xcosx

中，属于有界泛函的有______．（填上所有正确的番号）

The policeman asked ________ with the old women. 

A．what the matter was

B．what was the matter

C．what matter was

D．what was the wrong