“______something valuable and throw the rest away,”the mother asked her children when they were cleaning the old house.

A．Pick up

B．Pick out

C．Pick from

D．Pick off

在参与工程建设的各方中，应对工程项目的质量管理负总责的是__________。

A．勘察、设计单位

B．施工单位

C．工程监理单位

D．项目业主单位