题目

设，函数，使的的取值范围是( ) A．(－∞，0)                            B．(，＋∞) C．(－∞，)                       D．(0，＋∞) 答案：CIt’s generally considered that being named as Time’s Person of the Year is a(n)           of one’s success.     A．recognition    B．realization    C．contribution   D．achievement