Mary, 63, teaches painting, a skill she learned at a community college for senior citizens, while her husband Blare _______ head of the volunteer group.

A．makes for

B．brings up

C．takes on

D．serves as

桂枝汤中桂枝与芍药的比例是（）

A.1：2

B.2：1

C.3：1

D.1：1

E.3：2