治疗流行性脑脊髓膜炎首选的药物是（）
A.环丙沙星
B.利福平
C.多西环素
D.磺胺嘧啶
E.庆大霉素
参考答案：D
什么叫加工硬化现象
As we all know the H1N1 Flu is so serious, students can't go into the school ______ they take the
temperature and get sure they don't have a fever. [ ]
A. till
B. after
C. when
D. until
