以下哪个药物不是两性化合物（）
A.环丙沙星
B.头孢氨苄
C.四环素
D.大环内酯类抗生素
参考答案：D
村（社区）药具发放人员岗位职责是什么？
阅读理解。
1. If the English alphabet goes from A to Z,what goes J from Z to A?
Answer:____________________________________________
2. At night they come, Without being fetched,
And by day they are lost, Without being stolen.
Answer:_______________________________________________
