题目

 ______snow is white. The snow that covers the top of the mountain is _____ beautiful sight.   A. The; the       B. /; /       C. /; a          D. /; the 答案:C已知a为常数,a∈R,函数f(x)=x2+ax-lnx,g(x)=ex.(其中e是自然对数的底数)(Ⅰ)过坐标原点O作曲线y=f(x)的切线,设切点为P(x,y),求证:x=1;(Ⅱ)令,若函数F(x)在区间(0,1]上是单调函数,求a的取值范围.
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