第17题: [单项选择]可引起红细胞渗透脆性增高的溶血性贫血是() A. α海洋性贫血 B. β海洋性贫血 C. 镰型细胞贫血 D. 阵发性睡眠性血红蛋白尿 E. 遗传性球形细胞增多症 参考答案:E 答案解析:细胞的渗透脆性与红细胞的面积/体积的比值有关,海洋性贫血是珠蛋白肽链数量异常导致的HA,镰形细胞贫血是珠蛋白肽链质量(结构)异常导致的HA,均属于遗传性血红蛋白病,可排除;D和E均为红细胞膜异常导致的
第18题: [单项选择]Oxford University would be excluded out of those universities that receive PhD grants from ESRC, because the completion rate of its PhD students' theses within four years is lower than ______. A. 25% B. 40% C. 39% D. 10% 参考答案:C 答案解析:文中第二段,叙述了ESRC's response,指出它第一年的政策the national aver- age shot up to 39%,随后指出除非进一步提高completion rates否