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
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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
参考答案：B
| 阅读理解。 | ||||||
| Harry's father bought a magazine which gave its readers information about all kinds of products and helped them make the best choice while buying. Harry borrowed his father's magazine when he needed a new computer. "I'll read it and choose the best one." He said. The magazine described these computers. | ||||||
and do everything I want it to do." | ||||||
| 1. Harry wants to buy a computer, so he borrowed ________ from his father. | ||||||
| A. a computer magazine B. a magazine about all kinds of products C. a shopping book D. a book about all kinds of computers | ||||||
| 2. ________ doesn't have much memory and is rather slow. | ||||||
| A. The DGT PC450 B. The BNK 975XF C. The CGP 8PT D. Harry's computer | ||||||
| 3. The CGP 8PT is ________ among the three kinds of computers. | ||||||
| A. the fastest B. the most expensive C. the cheapest D. the slowest | ||||||
| 4. Harry chose the BNK 975XF because ________. | ||||||
| A. it is the most expensive B. it has lots of good software C. it has much memory D. it would work for him for a long time | ||||||
| 5. ________ helped Harry to choose the computer. | ||||||
| A. His father B. His friend C. The shopkeeper D. The magazine |
