化学结构中含有2个手性碳原子，其右旋体的活性高（）
A.异烟肼
B.甲氧苄啶
C.诺氟沙星
D.氟康唑
E.乙胺丁醇
参考答案：E
在Visual FoxPro文件中，CREATE DATABASE命令创建一个扩展名为______的数据库。
Mr. Lee, who ________ as a carpenter for over 10 years, is now a very famous statesman in this country.
A．has worked
B．had worked
C．worked
D．works
