Leonardo da Vinci(1452-1519)__________ birds kept in cages in order to have the pleasure of setting them free.

A．is said to be buying

B．is said to have bought

C．had said to buy

D．has said to have bought

我国监理单位资质管理部门对监理单位资质管理的主要职责是( )。

A．监理单位资质审批

B．核定资质等级

C．制定工程建设监理行政法规

D．监督、指导、协调所辖区域内的监理工作

E．制定有关监理单位资质的管理办法