7．John’s ability to learn from observations and experience_______greatly to his success in public life.

A．owed

B．attached

C．related

D．contributed

在行为的内因与外因中均有稳定性原因与易变性原因。稳定性原因包括（）。

A.人格特征

B.能力

C.天气

D.工作性质