下列药物中既能平肝潜阳,又能熄风止痉的是()
A.羚羊角
B.石决明
C.天麻
D.钩藤
E.磁石
参考答案:A,C,D
“战国七雄”不包括( )。
A.秦
B.晋
C.燕
D.楚
We didn't start our discussion _____ everybody arrived. [ ]
A. since
B. if
C. while
D. until