题目

The hunter shot at the birds ______ the big tree, only to shoot ______. A. on; nothing         B. on; neither               C. in; none           D. in; no one 答案：C在同一平面直角坐标系中，函数y＝ax2＋b与y＝bx2＋ax的图象可能是(　　)A. A B. B C. C D. D