A．Nonverbal behavior is easily controlled
B．A smile sometimes doesn’t mean a sincere smile
C．Nonverbal behavior accounts for much of the meaning we derive from conversation.
D．Nonverbal communication is more than the complement of verbal communication.

A.物物交换
B.通过媒介的商品交换
C.货币与货币的交换
D.货币与商品之间的交换