Nine in ten parents said there were significant differences in their approach to educating their

children compared with ________ of their parents. [ ]

A. those  

B. one

C. both  

D. that

根据《水利工程质量管理规定》(水利部令第7号)，组织有关单位进行工程质量验收、签证的主体是( )。

A．项目法人(建设单位)
B．设计单位
C．施工单位
D．质量监督机构