第11题: [单项选择]属于倍半萜类的化合物是 A. 龙脑 B. 梓醇苷 C. 紫杉醇 D. 青蒿素 E. 穿心莲内酯 参考答案:D 答案解析:[解析] 本题考查常见倍半萜的化学结构特点及含萜常用中药的化学结构。 青蒿素的化学结构是倍半萜。
第12题: [单项选择]Why hasn’t their mother bought the tickets A. She has no time to buy them. B. The ticket is expensive. C. She has no money. 参考答案:A 答案解析:[听力原文] M: Has mother bought the tickets for us yet F: No, she hasn’t. She was too busy.
第15题: [单项选择]女婴,日龄10天。排灰白色大便,考虑() A. 生理现象 B. 消化道梗阻 C. 胆道梗阻 D. 消化不良 E. 消化道出血 参考答案:C 答案解析:婴儿异常粪便:若大便干结,多因进食蛋白质偏多、淀粉或糖过少或肠蠕动弱、水分吸收过多所致;若大便呈黑色,系肠上部及胃出血或用铁剂药物或大量进食含铁食物所致;若大便带血丝,多系肛裂、直肠息肉所致;若大便呈