单选题A．左心室向心性肥大B．颗粒性固缩肾C．两者皆有D．两者皆无

单选题肝硬化的特征性病变是

单选题A．垂体后叶素B．6－氨基己酸C．维生素KD．去甲上腺素E．输新鲜血

单选题下列哪种抗心律失常药物属Ia类A．利多卡因B．吡二丙胺(丙吡胺)C．普罗帕酮(心律平)D．美西律(慢心律)E．胺碘达隆(乙胺碘呋酮)

单选题下列哪项不属于左心功能不全的临床表现A．心尖部舒张期奔马律B．交替脉C．呼吸困难D．颈静脉怒张E．端坐呼吸

单选题 左向右分流型先心病最常见的并发症是 A、亚急性细菌性心内膜炎 B、脑梗死 C、脑脓肿 D、肺炎、心力衰竭 E、咯血

单选题慢性心房颤动应用洋地黄的主要目的是( )(2009年)

单选题女，22岁，贫血，鼻出血，发热，全血细胞减少，白细胞分类未见到幼稚细胞。为鉴别非白血性白血病与再生障碍性贫血，最主要需检查( )(1990年)

单选题慢性支气管炎发展至肺气肿演变过程中，最早出现的是

单选题在类风湿关节炎发病中起主要作用的细胞是A．CD1+细胞B．CD4+细胞C．CD8+细胞D．B淋巴细胞E．巨噬细胞

单选题 自发性气胸的处理中正确的是： A、给氧、镇静剂 B、患侧卧位休息 C、气胸量小于20/%者均不必抽气减压，可待其自然吸收 D、给予强心剂 E、给予抗生素预防感染

单选题生活史中只有滋养体时期的原虫是 ( )

单选题Whether to teach young children a second language is disputed among teachers, researchers and pushy parents. On the one hand, acquiring a new tongue is said to be far easier when young. On the other, teachers complain that children whose parents speak a language at home that is different from the one used in the classroom sometimes struggle in their lessons and are slower to reach linguistic milestones. Would a 15-month-old child, they wonder, not be better off going to music classes? A study just published in the Proceedings of the National Academy of Sciences may help resolve this question by getting to the point of what is going on in a bilingual child’s brain, how a second language affects the way he thinks, and thus in what circumstances being bilingual may be helpful. Agnes Kovacs and Jacques Mehler at the International School for Advanced Studies in Trieste say that some aspects of the cognitive development of infants raised in a bilingual household must be undergoing acceleration in order to manage which of the two languages they are dealing with. The aspect of cognition in question is part of what is termed the brain’s “executive function”. This allows people to organise, plan, prioritise activity, shift their attention from one thing to another and suppress habitual responses. Bilingualism is common in Trieste which, though Italian, is almost surrounded by Slovenia. So Dr. Kovacs and Dr. Mehler looked at 40 “preverbal” seven-month-olds, half raised in monolingual and half in bilingual households, and compared their performances in a task that needs control of executive function. First, the babies were trained to expect the appearance of a puppet on a screen after they had heard a set of meaningless words invented by the researchers. Then the words, and the location of the puppet, were changed. When this was done, the babies who speak only one language had difficulty overcoming their learnt response, even when the researchers gave them further clues that a switch had taken place. The bilingual babies, however, found it far easier to switch their attention — counteracting the previously learnt, but no longer useful response. Monitoring languages and .keeping them separate is part of the brain’s executive function, so these findings suggest that even before a child can speak, a bilingual environment may speed up that function’s development. Before rushing your offspring into bilingual kindergartens, though, there are a few cautions. For one thing, these extraordinary cognitive benefits have been demonstrated so far only in “crib” bilinguals — those living in households where two languages are spoken routinely. The researchers speculate that it might be the fact of having to learn two languages in the same setting that requires greater use of executive function. So whether those benefits apply to children who learn one language at home, and one at school, remains unclear.

单选题患者，女，23岁，右下腹痛1月余，常伴有上腹或脐周腹痛，排便每日约2～4次，糊状，不含黏液和脓血，曾作过X线钡剂检查发现回盲部有跳跃征。最可能的诊断是

单选题关于动脉血CO2分压升高引起的各种效应，下列哪一项叙述是错误的 A.刺激外周化学感受器，使呼吸运动增强 B.刺激中枢化学感受器，使呼吸运动增强 C.直接兴奋呼吸中枢 D.使氧解离曲线右移

单选题关于结核病化疗原则，下列哪项不正确A．应坚持早期、联用、足量、规律、全程用药B．临床有结核中毒症状，X线片示病灶有炎性成分，需用化疗C．对病灶部分硬结，痰菌阴性者，可先观察，暂不用化疗D．利福平对杀灭被吞噬在细胞内的结核菌有效E．初治病例如条件允许，尽量采用短程化疗(6个月)

单选题患者60岁，反复咳嗽咳痰10余年。昨日晨突然出现气急，胸痛，呼吸困难。体检：唇发绀，气管向右移位，左肺呼吸音减低。

单选题慢性阻塞性肺病进展中最先异常的实验室检查为

单选题男性，57岁。心慌多汗半年，多饮、多尿1个月就诊。体检：明显消瘦，双眼突出，甲状腺Ⅱ度弥漫肿大，双上极可闻及血管杂音。血FT 3 33.5pmol／L，FT 4 40pmol／L，TSH0.01mU／L。

单选题下列哪项不是唾液的生理作用 A．部分消化蛋白质 B．清洁和保护口腔 C．分解食物中的脂肪 D．抗菌作用