常用于细菌性脑膜炎的抗生素有（）
A.头孢他啶
B.头孢曲松
C.头孢噻肟
D.万古霉素
E.利复星
参考答案：A, B, C, D
世界上最长的河流是__________，它发源于__________（地区）。
All his attention________on the computer game he was playing,so he even didn't notice his mother
enter the room. [ ]
A. has been fixed
B. was fixing
C. was fixed
D. fixed
