问题
单项选择题
下列关于氟喹诺酮类药物的作用机制，正确的是（）。
A.抑制细菌的转肽酶而影响细菌黏肽合成
B.抑制细菌二氢叶酸合成酶
C.抑制细菌蛋白合成
D.抑制细菌二氢叶酸还原酶
E.抑制细菌DNA螺旋酶，阻碍DNA复制
答案
参考答案：E
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下列关于氟喹诺酮类药物的作用机制，正确的是（）。
A.抑制细菌的转肽酶而影响细菌黏肽合成
B.抑制细菌二氢叶酸合成酶
C.抑制细菌蛋白合成
D.抑制细菌二氢叶酸还原酶
E.抑制细菌DNA螺旋酶，阻碍DNA复制
参考答案：E
A rich man was camping alone on a hill. One day it began to rain and the rain made the tent wet. At last he 1 make his way home. As he passed a beautiful house he 2 to look for rest. A lady in 3 walked past him with her 4 holding up high. Following her were her two pretty daughters. They stopped and stared at him 5 . “Who are you? We don’t like tramps（流浪汉）going around 6 our home .”one of them shouted. “Go away at once. ”cried the other. “But I’m not a 7 . ”said the man, “All I want is food and stay for the night.” “How 8 you come here? Go away at once!” they 9 “We don’t like your feet around our house. Go, go!” The man moved on and reached a 10 house. On entering it he saw a 11 preparing their supper. Though the light was 12 and the furniture was poor, it made him feel 13 and comfortable. “Can I have some 14 and rest for the night?” he asked. “Of course, friend,” said the woman, bringing forward a little chair for him. “We are going to15 our supper. Come and 16 us.” The food was not 17 but they shared it with the stranger. That night they let him sleep on their bed 18 they themselves used the stable（厩）. Early the next morning, the man said good-bye to them. Their 19 left him a memory full of thanks. When he reached home he 20 ordered a lovely house to be built for the couple in the woods.
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