普速铁路施工作业中，繁忙干线和干线封锁2小时以内的大型上跨铁路结构物施工是几级施工（）
A、特级
B、Ⅲ级
C、Ⅱ级
D、Ⅰ级
参考答案：C
The price of pork has not been kept under control as expected, and _____ is more surprising is that the price has risen by 15% just in the past few months．
A．that
B．which
C．what
D．it
骨折的愈合过程可分为（）
A.肉芽组织修复期
B.原始骨痂连接期
C.骨性愈合期
D.塑形期
E.假关节形成期
