苯海拉明（）
A.对组胺H1和H2受体均有作用
B.用于治疗消化性溃疡
C.用于治疗晕动症
D.用于治疗真菌病
E.用于治疗滴虫病
参考答案：C
解析：1.西咪替丁阻断H受体而抑制胃酸分泌。对五肽促胃液素、胆碱受体激动药及迷走神经兴奋所致的胃酸分泌也有明显的抑制作用。 2.苯海拉明属于H受体阻断药，具有抗晕、镇吐作用，可能与其中枢抗胆碱作用有关。 3.组胺与靶细胞上特异受体结合，产生生物效应。如作用于H及H受体，使血管舒张，毛细血管通透性增加，同时引起血压下降甚至休克。可增加心率和心肌收缩力，抑制房室传导，兴奋支气管、胃肠平滑肌H受体，引起支气管痉挛，胃肠绞痛。还可兴奋胃壁细胞H受体，引起胃酸分泌。 4.甲硝唑具有的作用包括：①抗阿米巴作用。对肠内外阿米巴大滋养体有直接杀灭作用，是治疗阿米巴病的首选药，也用于急性阿米巴痢疾和肠外阿米巴病的治疗；②抗滴虫作用；③抗厌氧菌作用；④抗贾第鞭毛虫作用。是目前治疗贾第鞭毛虫的最有效药物。
| 阅读下列短文，并做短文后的题目，从四个选项中，选出能回答所提问题或完成所给句子的最佳选项。 |
| "I hate school, and I'm not going back!"Have you ever had that thought? Lots of kids have had. Usually this feeling doesn't last long. But what if you feel this way too much? If you are stressed out, you might have a hard time making decision. In the morning, you can't decide what to eat, what to wear, or what to take for lunch. Sometimes it's a problem with your classes and schoolwork. Maybe the work is too easy and you get bored. Or maybe the work is too hard, or you don't feel as clever as the other kids. Reading may be difficult for you, but you are asked to do a lot of it. You may be getting farther and farther behind, and it may seem that you will never catch up with others. When you know why you don't like school, you can start taking steps to make things better. It's a good idea to talk to someone about your problems at school. Your mom, dad, friends, teachers, or even classmates will be able to help you. Another good idea is to write down your feeling about school. For instance, keep a diary or just write in a notebook. It's a great way to let out emotion that may be stuck inside you. And you don't have to share (分享) what you have written with others. The next time you find yourself disliking school, this will also help you: Make a list of everything you dislike or enjoy-even there is only one thing. See what you can change on "don't like"list. Could you find a way to show off your special interests and talents on what you like? Which activities could you try that would help you solve these"don't like"problems? Focus on what you can change and you might be able to put the good feeling back in school! |
| 1. This article mainly gives you some advice on . |
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| A. how to beat stress B. what if you don't like school C. how to deal with the problems in studies D. communications with your parents |
| 2. How many steps are mentioned in the article to make things better if you don't like school? |
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| A. Two. B. Four. C. Three. D. Five. |
| 3. What may cause you to have strong feelings against school? |
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| A. Being too stressed out. B. Not doing well in studies. C. Too much homework. D. A, B and C. |
| 4. We can know from the passage that . |
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| A. most students hate school in a way B. all the students have the same problems C. making a list can solve all your problems D. a diary is something personal |
| 5. The sentence "Focus on what you can change" in the reading means . |
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| A. do something to change the condition B. wait and see C. have a positive attitude towards schoolwork D. be friendly to others |