幂函数f（x）=xα的图象过点（2，4），那么函数f（x）的单调递增区间是（ ）．
（0，+∞）
- I heard that Lucy went to your house to say sorry to you.
- Yes. She went to my house _______ we were having dinner.
A. while B. which C. that
安德烈·包尚
