You can't imagine _____when they received these nice Christmas presents.

A．how they were excited

B．how excited they were

C．how excited were they

D．they were how excited

不属于苯二氮卓类药物作用特点的是（）

A．具有抗焦虑作用

B．具有外周性肌松作用（应该是中枢性）

C．具有镇静作用

D．具有催眠作用

E．用于癫痫持续状态