-It's generous_______ him to provide the poor children    so much food.

-Yes. I think he is the person that we should admire very much.

A．of; for

B．for; to

C．for; with

D．of; with

计量基准所复现的单位量值，通过（）逐级传递到工作计量器具，从而确保工作计量器具量值的准确可靠，确保全国计量单位制和量值的统一。

A.检定

B.校准

C.检定和校准

D.检测