第23题: [单项选择]维生素C降解的主要途径是() A. 脱羧 B. 氧化 C. 光学异构化 D. 聚合 E. 水解 参考答案:B 答案解析:由于维生素C是一种烯醇结构的物质,易被氧化破坏,维生素C的氧化是一个质子解离过程,氧化为脱氢抗坏血酸,并进一步水解形成2,3-二酮古洛糖酸,有氧条件下再被氧化为草酸和L-苏阿糖酸。
第28题: [单项选择]Questions 19~21 are based on the following talk.What should one do if he wants to work more efficiently at his low point in the morning A. Change his energy cycle. B. Overcome his laziness. C. Get up earlier than usual. D. Go to bed earlier. 参考答案:C 答案解析:[听力原文] 11-13 Do you find getting up in the morning difficult and painful This might be calle
第35题: [单项选择]患者胃痛,脘腹胀满,嗳腐吞酸,吐不消化食物,大便不爽,舌苔厚腻,脉滑。其治法是() A. 理气消胀 B. 消食导滞 C. 理气和胃 D. 消食健脾 E. 和胃止呕 参考答案:E 答案解析:患者胃痛有明显的伤食史,吐不消化食物,食积中阻,故脘腹胀满,嗳腐吞酸。治宜消食导滞,故选择B。肝胃气滞选A;胃气壅滞选C;脾胃虚弱选D;胃气上逆选E。