— Mr. Lee ____ to a student when I entered the classroom this morning.

-- He is very patient ____he is young.

A．talking; but

B．talks; though

C．was talking, though

D．talked, however

关于哮证的治疗，古代医学家中谁提出未发以扶正为主，既发以攻为急的原则

A．张仲景

B．张景岳

C．李东垣

D．朱丹溪

E．张子和