设函数
，若当 x→0时，
是
的等价无穷小，则a、k的值依次为（）
A . 2 , 1
B . 1 , 2
C . 
, 1
D . , 2
设函数，若当 x→0时，是的等价无穷小，则a、k的值依次为（）
A . 2 , 1
B . 1 , 2
C . , 1
D . , 2
lim _(xarrow 1)dfrac ({x)^2-1}(x-1)(e)^dfrac (1{x-1)}=
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