一why did you come in without my permission?

一       ．I won’t be have like that again．

A．No problem

B．I’m sorry

C．I suppose so

D．Take it easy

“虚”的病机概念，主要是指

A．卫气不固

B．正气虚损

C．脏腑功能低下

D．气血生化不足

E．气化无力