格林-巴利综合征经典的病理改变是
A．华勒变性B．轴突变性C．节段性脱髓鞘D．血管炎E．嵌压性神经病
参考答案：C
— Have you finished your composition already?
— Yes. I _____ it in twenty minutes. [ ]
A. am finishing
B. finished
C. will finish
D. finish
下列属于二级保护药材的是（）
A.川贝母
B.伊贝母
C.黄柏
D.黄芩
