题目

------ I was told that an accident happened some day last month.. Could you tell me where and when exactly?    ------I`m sorry I can`t remember when ______ accident happened. I only remember it was ______ Saturday morning ,when it was snowing.   A. the, the        B. the, a     C. a, a         D. a, the    答案：B聪聪有一张圆形纸片要想找到它的圆心，最少要将纸片对折（ ）次．A．1 B．2 C．3 D．4