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

单选题A．闭合性气胸 B．交通性气胸C．张力性气胸 D．继发性气胸E．创伤性气胸

单选题A．肠结核B．结肠癌C．克罗恩病D．溃疡性结肠炎E．细菌性痢疾

单选题A．手术治疗B．放射治疗C．化学疗法D．输血治疗

单选题A．淋巴道播散B．血道播散C．两者均有D．两者均无

单选题A．GHRH B．GHIRH C．低血糖 D．血中氨基酸增多

单选题低氧对呼吸的兴奋作用是通过( )(1998年)

单选题女性，70岁，因急性广泛前壁心肌梗死入院。查体：血压95/65mmHg，高枕卧位，双侧肺底可闻水泡音，心律整，心率108次份，可闻及奔马律，四肢末梢皮温正常。胸片示：心脏不大，主动脉迂曲钙化，两肺门阴影增大、模糊。按Killip分级，该患者心功能应属于

单选题下列关于呼吸的说法，错误的是 A.平静呼吸时，吸气是主动的，呼气是被动的 B.深呼吸时，吸气和呼气都是主动的 C.平静呼气时无呼气肌参与 D.腹式呼吸是以腹肌舒缩为主的呼吸运动

单选题 脊髓灰质炎前驱期休息隔离的时间是 ( ) A、7天 B、14天 C、30天 D、40天 E、50天