骨关节结核首先好发部位是()
A．踝关节
B．膝关节
C．脊柱
D．肘关节
E．腕关节
参考答案：C
When you are ill, you should go to the _____.[ ]
A. dentist
B. worker
C. teacher
D. doctor
导致不舒适的原因有哪些？
