Speaker A: I'd like to buy a copy of Professor Franklin's book on shells.Speaker B: ______

A．Are you one of Professor Franklin's students

B．But I like his book on fish better than that on shells.

C．I'm sorry, sir. That book has been out of print for some time now.

D．Will you pay over there at the cashier

关系数据库语言SQL基本有两种使用方式，在一种使用方式下，它是面向集合的描述型语言，它是非过程性的，大多数语句都可以独立执行，与上下文无关。这种使用方式称之为( )。

A．宿主语言

B．嵌入式语言

C．数据定义语言

D．自含式(或交互式)语言