问题
单项选择题
喹诺酮类抗菌药的主要作用机制是（）
A.干扰细菌细胞壁合成
B.损伤细胞膜
C.影响细菌蛋白质的合成
D.抑制细菌核酸的合成
E.抑制固醇类药物的合成
答案
参考答案：D
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喹诺酮类抗菌药的主要作用机制是（）
A.干扰细菌细胞壁合成
B.损伤细胞膜
C.影响细菌蛋白质的合成
D.抑制细菌核酸的合成
E.抑制固醇类药物的合成
参考答案：D
| 阅读理解。 |
| Mr. Smith is walking in the park. He is tired. He wants to have a rest. He sees a green chair under a big tree. So he walks to the chair. There is another man in front of him. He is walking to the chair, too. He has a board (木板) in his hand. Mr.Smith is very worried (着急的). He begins to run quickly. The man sees him and begins to run, too. But Mr. Smith gets to the chair before the man. He is very happy and sits in the chair. When the man comes, he says nothing but gives Mr. Smith the board. The board says,"Wet Paint (油漆未干)." |
| 1. Where is Mr.Smith? |
[ ] |
| A. In the garden B. At home C. In the park D. On the street |
| 2. How does Mr. Smith feel? |
[ ] |
| A. Happy B. Hungry C. Thirsty D. Tired |
| 3. What does he see under a big tree? |
[ ] |
| A. A chair B. A bike C. A house D. A bird |
| 4. Why does he walk to the chair? |
[ ] |
A. He wants to paint it. |
| 5. What is on Mr. Smith's cloths? |
[ ] |
| A. Water B. Paint C. A flower D. A board |