肘关节脱位的特有体征（）。
A．患肘肿痛、不能活动
B．以健侧手托患侧前臂
C．肘后三角关系正常
D．肘后三角关系异常
E．肘关节处于半伸直位
参考答案：D
A dentist works in a _____. [ ]
A. school
B. hospital
C. company
D. shop
- I'm going to the post office.
-_______ you're there , can you get me some stamps?
A．As
B．While
C．Because
D．lf
