具有补气、托毒生肌功效的药物是（）
A.人参
B.党参
C.西洋参
D.黄芪
E.白术
参考答案：D
---How long have you been studying at this school?
--- I have been studying here____.
A．since I was thirteen years old
B．when I was thirteen
C．at the age of thirteen
D．after I was thirteen
急性脑梗死发病后，在多长时间内，其CT表现可无异常()
A．0～6小时
B．10～12小时
C．14～18小时
D．20～24小时
E．32～36小时
