皮肤针的操作其着力部位主要是（）。
A.手指
B.手腕
C.手掌
D.前臂
E.肘关节
参考答案：B
列举中国人民近代化探索的四件大事。
___________________________________________________________________________________________
If I ______ you, I _____the job.
A．was; will take
B．was; would take
C．were; would take
D．were; will take
