It is necessary for children to exchange ideas with parents from time to time so that the generation gap between parents and children can be _________.

A．released

B．replaced

C．narrowed

D．disappeared

下列合同的印花税税率为5‰的是( )。

A．建筑工程勘察设计合同

B．借款合同

C．建筑安装工程承包合同

D．技术合同