—Listen! Someone is singing in the next room. Who _______ it be? Is it Wei Fang?

—No. It _______ be her. She is at school now.[ ]

A. will; may not

B. must; mustn't

C. may; can't

D. may; won't

关于水合氮醛，叙述正确的是（）

A.对胃肠道无刺激

B.无成瘾性

C.无肝、肾功能损害

D.安全范围大

E.醒后无后遗效应