One tool that is useful during both analysis and design is the （）,which is a pictorial representation of the items of information(entities) within the system and the relationships between these pieces of information.

A.data dictionary

B.dataflow diagram

C.use case diagram

D.entity-relation ship diagram

我国深化文化体制改革的重点是( )。

A．繁荣文化市场

B．创新体制机制

C．壮大文化产业

D．转变政府职能