题目

在同一直角坐标系中，一次函数y＝ax＋c和二次函数y＝a(x＋c)2的图象大致为() A . B . C . D . 答案：BShortly after the accident, two___________ police were sent to the spot to keep order. A. dozens of　　 B. dozens　　 C. dozen of　　 D. dozen