肾气丸的药物组成是（）
A.干地黄、山茱萸
B.茯苓、薯蓣
C.党参、白术
D.牡丹皮、泽泻
E.附子、桂枝
参考答案：A, B, D, E
Little Tom was very nervous in front of so many strangers, so he ____ and ran to his mother. [ ]
A. turned out
B. turned off
C. turned down
D. turned around
网络图中相邻两节点（）。
A.可以出现循环线路
B.编号可以重复
C.箭线中间可以引出箭线
D.只能有一条箭线相连
