— Jane, can you play ________ baseball?
— No, I can't. But I can play ________ violin.
A:the; the
B:/; the
C:/; /
D:the; /
近年来“绿色GDP”以成为我省苏南一些地区衡量经济的重要指标,以下关于“绿色GDP”的叙述正确的是( )
(Ⅰ)a=1时,试判断f(x)的单调性并给予证明;
(Ⅱ)若f(x)有两个极值点x1,x2(x1<x2).
(i) 求实数a的取值范围;
(ii)证明:﹣ e2<f(x1)<−1 . (注:e是自然对数的底数)