题目

已知方程在上有两个不等的实数根，则实数的取值范围为（     ） A．        B．       C．      D． 答案：C It was the dream that he would make ______ good fortune on the international stages that made Lang Lang decide to go to the USA for ______ further study.A．a, a B．/, the C．a, /D．the, the