As Susan stared at ______ piles of plastic in her recycling bin, ______ strong sense of responsibility made her stick to her recycling work.

A．不填；不填

B．不填; a

C．the ; a

D．the; the

当组织多层结构流水施工时，下列（）情况下施工班组不能够连续施工造成窝工（m为施工段数，N为施工过程数）。

A、m=N

B、p>N

C、m<N

D、m与N无关