I know Mr Brown； we ＿＿＿＿＿＿ to each other at an international conference.

A．are introduced

B．have been introduced

C．were introduced

D．had been introduced

治疗胎位不正的常规针灸操作方法有（）。

A.针刺补法

B.针刺泻法

C.雀啄灸法

D.小艾炷灸法

E.温和灸法