________, the gathering crowd burst into applause.

A．On entering the hall

B．When he took the floor

C．The speaker took his place

D．No sooner had the speaker entered

川贝母与浙贝母均具有的功效是（）

A.清肺养阴止咳

B.温肺化痰止咳

C.泻肺化痰止咳

D.燥湿化痰止咳

E.清热化痰止咳