题目内容

细菌对青霉素产生的耐药机制为（）

A. 产生水解酶
B. 产生合成酶
C. 原始靶位结构改变
D. 胞浆膜通透性改变
E. 改变代谢途径

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四环素类抗生素的作用靶位是（）

A. 细菌核蛋白体30S亚基
B. 细菌核蛋白体50S亚基
C. 细菌胞浆膜上特殊蛋白PBPs
D. 二氢叶酸合成酶
E. DNA螺旋酶

抗菌素越贵越好（）

A. 对
B. 错

I wonder if the psychologist will come to our school this weekend.If he_____ , we will be very excited.

A. come
B. comes
C. will come
D. came

It’s reported that some capsules(胶囊)are really bad for our health.Sounds terrible. Hopefully the problem _____ as soon as possible.

A. is solved
B. has solved
C. was solved
D. will be solved