A:省
B:县
C:乡
D:地区
圆C1:x2+y2+2x﹣6y+1=0和圆C2:x2+y2﹣4x+2y﹣11=0.求圆C1、圆C2的公切线的条数.
—No, we still need to buy a map before we start the trip.