Little _____ about her own safety, though she was in great danger herself.

A．did Mary care

B．Mary did care

C．Mary does care

D．does Mary care

确定目标高低的原则是，目标一般略高于执行者的（），使之经过努力可以完成。

A、智慧

B、知识

C、能力和水平

D、ABC都不是