A:左上角
B:右下角
C:右上角
D:左下角
The book must be Lily's. Look! __________ name is on the cover
(Ⅰ)判断f(x)的奇偶性;
(Ⅱ)用函数单调性的定义证明:f(x)在(0,+∞)上是增函数.