杏仁、苏子的功效是

A．降气祛痰，宣散风热
B．止咳平喘，润肠通便
C．泻肺平喘，利水消肿
D．润肺止咳，杀虫灭虱
E．清肺化痰，止咳平喘

. It’s difficult to ____ a conversation in a noisy room.

A．carry out

B．carry on

C．speak of

D．talk to