( )是建设项目负责人整体素质的本质，具有相对的稳定性。

A．品格素质

B．知识素质

C．能力素质

D．心理素质

None of these ______ is an end in itself. They are tentative, experimental. They are movements not towards something definite but away from something definite.

A．assurance

B．expedients

C．awareness

D．doubts