—Please clean up the classroom. It's really a_____.

—OK. I'll do it at once.[ ]

A. mess

B. dirt

C. matter

D. trouble

国有企业改革按照产权清晰的要求，企业应拥有( )。

A．重大决策权

B．经营自主权

C．资产所有权

D．法人财产权