简述骨折的三期用药原则。
参考答案：
①初期宜活血化瘀，消肿止痛为主。②中期宜接骨续筋为主。③后期宜壮筋骨，养气血，补肝肾为主。
___________ name is Jenny.[ ]
A. My
B. You
C. I
Jack's brother doesn't work so _________as Jack.
A．harder
B．hard
C．hardest
D．hardly
