人们把社会生产的各个部门划分为三类产业，下列属于第三产业的是[ ]
A、农业
B、工业
C、建筑业
D、服务业
答案：D
---You were out when I went to your house this morning.
---Oh, I _______ for a friend from England at the airport.
A．was waiting
B．waited
C．am waiting
D．have waited
一些极有意义的沟通既非口头形式也非出面形式的沟通方式称为（）
A.电子媒介沟通
B.电话沟通
C.非言语沟通
