患者男性，46岁，反复发作性喘憋7年，加重1周。夜间不能平卧。入院后查体：双肺散在哮鸣音，呼吸30次/分。既往有甲亢病史。入院后给予氨茶碱和沙丁胺醇（舒喘灵）等治疗
关于沙丁胺醇（舒喘灵）的平喘作用原理，下列哪项是错误的（）
A.主要刺激β肾上腺素能受体
B.激活腺苷环化酶
C.阻止cAMP衍变成5-AMP
D.与氨茶碱合用有协同作用
E.提高肥大细胞内的cAMP浓度
参考答案：C
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| Time flies so quickly! We become mature (成熟的) girls or boys, or at least we 1 we are. At the same time, our parents are no longer young. They 2 all they have to us but never look forward to getting 3 back. When we are all in bed, they stay with us day and night. When we're hungry or cold or sad, they 4 offer help. But what have we done for our parents? 5 we grow up, we have our own ideas and we believe we are 6 enough to think and act by ourselves, so we usually dislike their care. 7 , we don't listen to them; sometimes even quarrel with them! We must 8 something now, letting them know that we love them, too. Try our best to understand our parents, and not to make them feel hopeless. In a word, make it a duty to bring 9 to them because that's the sign that we are really mature. Children are parents' 10 and we are carrying both our dreams and theirs. The pleasure of our parents is what we should try to do! | ||||
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