题目

如图，在平面直角坐标系中，A（-2，-1），B（-1，-1），若抛物线与线段AB有交点，则的取值范围是______. 答案：【答案】【解析】分别把A、B点的坐标代入y=ax2得a的值，根据二次函数的性质得到a的取值范围．解：把A（-2，-1）代入y=ax2得a=；把B（-1，-1）代入y=ax2得a=-1，所以a的取值范围为故答案为： "I'm more nervous right now than when I _________," Jane said, as she saw the group of reporters waiting anxiously at the exit of the gym． [　　] A．had competed B．compete C．was competing D．have competed