下列语句中，正确的是（ ）
A：长度相等的弧是等弧；等弧对等弦
B：在同一平面上的三点确定一个圆
C：直径是弦；半圆是劣弧
D：三角形的外心到三角形三个顶点的距离相等
—Yes, I do. And l also know that some of them are scaring.
选出最佳应答语。
A．No，they are not．
B．They are ducks．
C．Seven．
D．Yes，it is．
E．Yes，I do．
