具有补肾益精、益气、养血功效的药物是（）
A.胡桃肉
B.蛤蚧
C.冬虫夏草
D.紫河车
E.黄芪
参考答案：D
— Did you find the missing couple in the mountain yesterday?
— No, but we________to get in touch with them ever since. [ ]
A. have tried
B. have been trying
C. had tried
D. had been trying
压缩性骨折最常见于（）
A.颅骨
B.腓骨
C.椎体
D.跟骨
E.胫骨
