I like __________ color of your skirt. It is __________ good match for your blouse.

A．a; the

B．a; a

C．the; a

D．the; the

质量为m的滑块从半径为R的半球形碗的边缘滑向碗底，过碗底时速度为v，若滑块与碗间的动摩擦因数为μ，则在过碗底时滑块受到摩擦力的大小为（ ）

A．μmg

B．μm

C．μm(g+)

D．μm(-g)