喹诺酮类（） A．青霉素V B．苯唑西林 C．替卡西林 D_爱下问搜题

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问题单项选择题

喹诺酮类（）

A．青霉素V

B．苯唑西林

C．替卡西林

D．哌拉西林

E．舒巴坦

答案

参考答案：E

解析：

头孢菌素类药物抗菌作用机制与青霉素相同，作用于转肽酶，阻止细菌细胞壁的合成，也能与胞浆膜上某些PBPs结合而抑制细菌生长。氨基糖苷类药物抗菌作用基本相同，主要是阻碍敏感细菌蛋白质的合成，能影响蛋白质合成全过程。甲氧苄氨嘧啶抗菌作用机制是抑制二氢叶酸还原酶，使二氢叶酸不能还原成四氢叶酸，而阻碍敏感细菌叶酸代谢和利用。喹诺酮类药物作用的靶酶是敏感细菌的DNA回旋酶。DNA回旋酶在DNA复制的起始阶段，使呈超螺旋状态的DNA松弛和解结，有利于DNA的解链，在复制的末期，也促使母链DNA与新合成链的互相缠绕，形成扭结或连环。喹诺酮类药物主要能与DNA回旋酶亚基A结合，从而抑制酶的切割与连接功能，阻止DNA复制，呈现抗菌作用。

完形填空

As we all know “ The hand that rocks the cradle rules the world.” and “ 26 every successful man there is a woman.” Both these   27 mean the same things. Men rule the 28__ , but their wives rule them.
Chinese people and other foreigners often say, 29_ of the American women like making their husbands and sons successful, but some of them want   30__ for themselves. They want good 31 . When they work they want to 32__ better paid. They want to be as 33__ as men.
In the 1960s, the American women’s liberation   34  was started by women who don’t want to   35  behind successful men. They want to stand beside them, with the same 36__ for success. They don’t want to be told that certain jobs or   37__ are closed to them. They refused to work side by side with men who do the 38  work for higher pay.
In America, a liberation woman must be   39  of being a woman and have confidence in herself. If somebody says to her, “ You have come a long   40  , baby”, she will   41  and answer, “Not nearly as 42 as I am going to go, baby.”
On the other hand , this movement is quite 43 and many American women do not agree. 44__ it has already made some important 45__ in women’s lives.

B．improvement

判断题

只有在基础研究方面拥有了坚固根基，我国未来的技术创新能力才能得到实质性提升。