喹诺酮类抗菌药的作用机制是A．抑制细菌的蛋白质合成 B．抑制细_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题单项选择题

喹诺酮类抗菌药的作用机制是

A．抑制细菌的蛋白质合成

B．抑制细菌的DNA回旋酶

C．抑制细菌的RNA回旋酶

D．抗细菌的叶酸代谢

E．抗细菌的嘌呤代谢

答案

参考答案：B

选择题

— Oh, I'm really fed up with Jim. He's always causing me trouble.

— I _____ you to keep away from him! But you wouldn't listen. [ ]

A. told

B. tell

C. have told

D. would tell

选择题

----- _______ school were you at last year?

----- Centre School.

A．What

B．Which

C．That

D．Where