To celebrate the New Year, the students stayed in the classroom after school, _____ the performances and ______ the room.

A．practicing ; preparing

B．practiced ; prepared

C．to practise ; prepare

D．practicing ; prepared

某老年人跌倒后，右髋疼痛，步行到医院，X线片示外展型嵌插型股骨胫骨折，正确的治疗方法是

A．持续皮牵引固定6～8周

B．皮牵引6～8周后，三刃钉内定

C．立即手术行三刃钉内固定

D．髋人字石膏固定

E．夹板固定