治疗C群流行性脑脊髓膜炎首选抗生素为（）
A.氯霉素
B.青霉素G
C.磺胺甲异噁唑
D.头孢曲松
E.利福平
参考答案：B
It is Ms Chen’s serious attitude________ her work and her interesting methods of teaching that
make us like her very much.
A．with
B．on
C．towards
D．about
计算第121号频道上下行工作频率。
