既能平肝阳又能清肝热的药物是（）
A.全蝎
B.牛黄
C.蜈蚣
D.天麻
E.钩藤
参考答案：E
有下列二叉树，对此二叉树前序遍历的结果为( )。
A．ACBEDGFH
B．ABDGCEHF
C．HGFEDCBA
D．ABCDEFGH
The two men have been very intimate and reliable friends throughout their lives.
