A:being aimed at
B:aimed at
C:having aimed at
D:having been aimed at
(I)求a,b的值,判断并证明函数f(x)的奇偶性;
(II)证明:函数f(x)在区间 2 ,+∞)上单调递增.
下列字形和加横线字注音全部正确的一项是( )