David got well-prepared for the university interview, for he couldn’t risk the good opportunity ________.

A．to lose

B．losing

C．to be lost

D．being lost

急性肾功能衰竭少尿期病人最常见的死亡原因是（）。

A.低钠血症

B.高钾血症

C.酸中毒

D.低钙血症

E.高磷血症