—No wonder you caught a cold. You _______out last night without a coat.

—I know how silly I was.

A．shouldn’t have gone

B．mustn’t have gone

C．couldn’t have gone

D．mightn’t have gone

老年病人护理难度大是由于他们（）

A.听力下降，记忆力差

B.疼痛阈增高

C.自理、自控能力差

D.要求实现自我价值