—Tomas Edison always ________ too late, because he thought sleeping at night is to waste time.

—Oh. He was really a strange man.[ ]

A. put up            

B. stayed up

C. woke up            

D. got up

潜在的总供给发挥程度的高低，取决于多种因素的作用和影响。最终决定总供给能力发挥到何种程度的关键是( )。

A．供给能否实现大于需求

B．供给能否实现市场交换，与需求相吻合

C．潜在的总供给发挥程度的高低

D．需求能否实现大于供给