He felt lonely in the first month abroad, but after some time he got ______ alone and even enjoyed ______ there. [ ]

A. used to living; to study

B. used to five; studying

C. used to living; studying

D. used to live; to study

躁狂发作睡眠障碍的特点是（）

A.入睡困难

B.多梦

C.早醒

D.易惊醒

E.睡眠需要减少