The young teacher came to her class every week, but his attitude ____ he was not really interested in the

subject. [ ]

A. expressed

B. described

C. explained

D. suggested

一个企业的领导者直接管理几个部门的控制系统的沟通形式为()

A.环式 

B.Y式 

C.轮式 

D.全通道式