①BB×BB ②bb×bb ③BB×bb ④Bb×Bb ⑤Bb×bb ⑥BB×Bb.
A:④⑤②
B:④⑤⑥
C:④②⑤
D:①②③
She reached the top of the hill and stopped _______ on a big rock by the side of the path.
若两圆的半径分别是2cm和5cm,圆心距为3cm,则这两圆的位置关系是( )