Rather than ________ abroad with her parents, she preferred __________ volunteer work during the holiday.

A．to travel; to do

B．travelling; doing

C．travel; to do

D．to travel; doing

应用非甾体类消炎止痛药治疗骨性关节炎的原则是

A．无症状或症状较轻时，不用非甾体类消炎止痛药

B．疼痛明显时服用，症状消失后停用

C．药物剂型和剂量要求个体化

D．不应联合使用非甾体类消炎止痛药

E．对于年龄较大的患者，应慎重选用非甾体类消炎止痛药