氮平衡状态常见于（）
A.疾病恢复期病人
B.健康成年人
C.儿童、青少年
D.老年人
E.孕妇
参考答案：B
秒针从4走到11，走了______大格，是______秒．
— How about going hiking this weekend?
— Sorry, I prefer _____ rather than _____. [ ]
A. to stay at home; go out
B. to go out; stay at home
C. staying at home; go out
