--- Did you say that Miss Green is coming to see me?

--- It’s strange. I’ve never       her before.

A．heard for

B．heard of

C．heard

D．heard from

要遵守某一标准，就要遵守该标准中的（）中所规定的内容。

A.规范性要素

B.资料性要素

C.所有要素

D.核心内容