正五棱柱中，不同在任何侧面且不同在任何底面的两顶点的连线称为它的对角线，那么一个正五棱柱对角线的条数共有[ ]

A.20

B.15

C.12

D.10

The young couple are always quarreling ____ family affairs, so it’s only a matter ____ time before they get divorced.

A．over, of

B．of, of

C．over, over

D．or, over