肾为封藏之本是指（）
A.肾气与冬气相应
B.肾无实而不可泻
C.肾精、命火宜潜藏
D.肾为胃关、司二便
E.肾主纳气归于肾
参考答案：C
He was _ busy that he forgot to have supper yesterday. [ ]
A. too
B. very
C. so
D. quite
牡蛎散的组成中有（）
A.党参
B.白术
C.山萸肉
D.生黄芪
E.五味子
