第23题: [单项选择]A. His mother liked it but his father didn’t. B. They both liked it. C. His father liked it but his mother didn’t. D. Neither liked it. 参考答案:C 答案解析:[解析] W: How did your parents like the play they watched last week M: My mother thought the l
第28题: [单项选择]引起血清钙离子浓度降低的因素是()。 A. 血浆蛋白浓度降低 B. 血pH升高 C. 血磷降低 D. 血1,25-(OH)2D增高 E. 甲状旁腺功能亢进 参考答案:B 答案解析:影响血清钙离子浓度的因素有血pH、血浆蛋白浓度和血磷浓度。碱中毒导致H+与钙离子交换加强,使钙离子进入细胞内,血钙降低。后三项都引起血钙升高蛋白质低时,蛋白结合钙减少,使总钙量降