题目

二次不等式ax2+bx+1＞0的解集为{x|﹣1＜x＜}，则ab的值为（ ） A．﹣5  B．5    C．﹣6  D．6 答案：D Brought up in the countryside, she found it quite difficult to ________ the life of the big city． [　　] A．go with B．fit for C．live up to D．fit in with