题干
A __________ girl named Dong Xinyi looked after her disabled father.
A：three-year-old
B：three-years-old
C：three years old
答案(点此获取答案解析）
A
A __________ girl named Dong Xinyi looked after her disabled father.
A：three-year-old
B：three-years-old
C：three years old
且
，则连接
两点的直线与圆心在原点上的单位圆的位置关系是
