______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.