最符合心力衰竭概念的描述是（）。

A.心肌收缩功能障碍

B.心肌舒张功能障碍

C.心排血量不能满足机体代谢需要

D.心肌做功能力下降

E.心肌自律性降低

Either you or one of your students________ to attend the meeting that is due tomorrow.

A．are

B．is

C．have

D．be