一副扑克牌共54张（含大小王），要保证至少有6张牌的花色相同，至少从中摸出的牌数是[ ]

A .23

B. 24

C. 25

D. 26

—The presidents of China and Russia had ____ interview a short time ago.

—And it was ____ great success.

A．an, the

B．the, a

C．an, a

D．the, /