第33题: [单项选择]Questions 11 to 18 are based on the conversation you have just heard. A. She’s rather happy to hear so. B. She’s disappointed to hear so. C. She’s unhappy to hear so. D. She’s surprised to hear so. 参考答案:A 答案解析:[听力原文] M: You don’t look a day over thirty. W: Really In fact, I’m thirty-five. Q: How doe
第34题: [多项选择]HbO2解离曲线是S形的原因是 A. Hb含有Fe2+ B. Hb含四条肽链 C. Hb存在于红细胞内 D. Hb属于变构蛋白 E. 由于存在有2,3-BPG 参考答案:D 答案解析: [解释] HbO2的氧解离曲线呈S形是因为Hb属于变构蛋白。