题目

已知直线：（）被圆所截的弦长是圆心到直线的距离的2倍，则等于（ ）A. 6 B. 8 C. 9 D. 11 答案：【答案】C【解析】由题设可知圆的圆心为，圆心到直线的距离，依据题意，即（舍去），应选答案C。 It took us quite a long time to get to the amusement park. It was 　　　 journey. 　　　 A. three hour B. a three-hours　　　　　　 C. a three-hour D. three hours