American fathers ______ more than twice the amount of time with their children than they used to in years past, due to a sweeping new trend called "unemployment".

A．were spending

B．spent

C．are spending

D．have spent

骨折移位的常见类型有（）

A.成角

B.横向移位

C.重叠移位

D.分离移位

E.旋转移位