A. girls are intelligent B. girls are certain about themselves C. girls attach more importance to education D. they are better educated at home 参考答案:C 答案解析:[解析] 根据“John Dunsford,leader of the association of head teachers of secondary schools,says that that
第18题: [多项选择]慢性贫血,血红蛋白低于60g/L,但仍可无明显症状,与何因素有关() A. 红细胞内2,3-二磷酸甘油酸浓度上升 B. 红细胞内2,3-二磷酸甘油酸浓度下降 C. 血红蛋白与氧的亲和力降低 D. 氧离曲线左移 E. 贫血发生的速度慢 参考答案:A, C, E 答案解析:慢性贫血可使RBC内2,3-DPG含量增加,使Hb和氧亲和力降低,氧解离曲线右移,在组织中释放更多的氧。
第20题: [单项选择]Questions 23 to 25 are based on the conversation you have just heard.A. Because it is difficult to find out. B. Because not everyone can find the exact reason. C. Because there are too many reasons. D. Because the man has never found out. 参考答案:C 答案解析:[解析] 23-25 M: I am tired all the time. It really gets to me. How can I stop it W: The first t