An epigram is usually defined being a bright or witty thought that is tersely and ingeniously expressed.

A．as

B．as be

C．as been

D．to being

教师劳动与其他行业的劳动相比，具有（）显著特点。

A.独立性和自主性

B.简单性和短期性

C.复杂性和创造性

D.迟效性和长效性