"十八反"中，与乌头相反的药物是（）
A.半夏
B.甘草
C.牛黄
D.人参
E.陈皮
参考答案：A
Mary has two brothers, ________ are doctors.
A．both of they
B．both of whom
C．both of them
D．whom of both
治疗外感风寒，表实无汗，咳嗽气喘者，宜首选（）
A.桔梗
B.石膏
C.桂枝
D.麻黄
E.前胡
