题干
— Mom, shall we go hiking tomorrow?
— Oh, dear. That depends on it will be fine tomorrow.
A：that
B：whether
C：how
D：what
答案(点此获取答案解析）
B
，动点P在以点C为圆心，且与直线BD相切的圆内运动，设
，则
的取值范围是 ( )