Mark was a student at this university from 2006 to 2011，________he studied very hard and was made Chairman of the Students’ Union.

A．during which time

B．for which time

C．during whose time

D．by that time

患者男性，8岁，因“从2米高树上跌落1小时”来诊。患者跌落时右手掌着地，当时感右肘部疼痛难忍，继之出现肘部肿胀及功能障碍。

急诊处理的原则是（）

A.检查是否颅脑损伤

B.检查患肢的血液循环情况

C.患处行临时固定后摄Ｘ线片

D.切开复位内固定

E.及时手法复位固定

F.首先清创