单选题男性，19岁，反复左踝关节肿痛1年，偶有晨起背部不适，化验HLAL－B27(＋)，最可能的诊断是

单选题刚地弓形虫的侵入途径是 ( )

单选题男性，55岁，农民，因肌肉高度紧张和唾液分泌过多而入院。他妻子说他最近出现发热和寒颤，身体虚弱，拒绝进食，因不明原因脾气暴躁，难以自控。他是一个狂热的户外运动者和洞穴探险者。患者入院后不久，便有吞气症、恐水症和癫痫发作，神志清醒和幻觉交替。4天后，患者死亡，常规血和脑脊液细菌培养均为阴性。大脑尸检表明有内基小体的存在。

单选题哪些指标与甲状腺功能亢进症的病情呈平行关系

单选题Increasingly, historians are blaming diseases imported from the Old World for the great disparity between the native population of America in 1492--new estimates of which jump as high as 100 million, or approximately one-sixth of the human race at that time--and the few million full-blooded Native Americans alive at the end of the nineteenth century. There is no doubt that chronic disease was an important factor in the sharp decline, and it is highly probable that the greatest killer was epidemic disease, especially as manifested in virgin-soil epidemics. Virgin-soil epidemics are those in which the populations at risk have had no previous contact with the diseases that strike them and are therefore immunologically almost defenseless. That virgin-soil epidemics were important in American history is strongly indicated by evidence that a number of dangerous maladies--smallpox, measles, malaria, yellow fever, and undoubtedly several more--were unknown in the pre-Columbian New World. The effects of their sudden introduction are demonstrated in the early chronicles of America, which contain reports of horrible epidemics and steep population declines, confirmed in many cases by quantitative analyzes of Spanish tribute records and other sources. The evidence provided by the documents of British and French colonies is not as definitive because the conquerors of those areas did not establish permanent settlements and began to keep continuous records until the seventeenth century, by which time the worst epidemics had probably already taken place. Furthermore, the British tended to drive the native populations away, rather than to enslave them as the Spaniards did; so that the epidemics of British America occurred beyond the range of colonists' direct observation. Even so, the surviving records of North America do contain references to deadly epidemics among the native population. In 1616--1619 an epidemic, possibly of pneumonic plague, swept coastal New England, killing as many as nine out of ten. During the 1630's smallpox, the disease most fatal to the Native American people, eliminated half the population of the Huron and Iroquois confederations. In the 1820's fever ruined the people of the Columbia River area, killing eight out of ten of them. Unfortunately, the documentation of these and other epidemics is slight and frequently unreliable, and it is necessary to supplement what little we de know with evidence from recent epidemics among Native Americans. For example, in 1952 an outbreak of measles among the Native American inhabitants of Ungava Bay, Quebec, affected 99 percent of the population and killed 7 percent, even though some had the benefit of modern medicine. Cases such as this demonstrate that even diseases that are not normally fatal can have destroying consequences when they strike an immunologically defenseless community.Notes: disparity 差距。 virgin-soil处女地。 malady 疾病 chronicle 编年史。 tribute 贡品。 pneumonic plague肺鼠疫。confederation 同盟。 smallpox 天花。measles 麻疹。

单选题女性，45岁，过去无明确心脏病症状。体检曾发现有二尖瓣轻度脱垂，但无自觉症状。近2周因感冒后出现持续低热(体温38℃)，心率90次/分，律齐。心尖区可闻(2～3)/6级反流样杂音，血常规：白细胞1．0×10 9 /L，中性78％，核左移，红细胞3．5×10 12 /L，血红蛋白100g/L，眼结膜有瘀斑，尿蛋白(+)，眼底见Roth斑，血培养3次，其中两次可培养到草绿色链球菌。超声心动图未发现赘生物。关于该例的诊断，正确的是

单选题在治疗休克过程中，监护输液量及输液速度的最好的指标是

单选题导致急性左心功能不全的原因是

单选题原发性肺结核病的病变特点是( )(1993年)

单选题下列哪项不符合呼吸性酸中毒合并代谢性酸中毒的血气检查结果A．PaCO2升高B．减少C．AB=SB≤正常值D．BE负值减小E．pH明湿降低

单选题哪项是慢性肺源性心脏病所不具备的( )(1992年)

单选题男性，41岁，因咳嗽、咳脓痰反复发作，间断咯血20余年，加重3天就诊。该患者有10年吸烟史，平均10支／天，已戒烟2年。查体左下肺可闻固定性湿啰音。胸片示双下肺纹理紊乱，以左下为著。最可能的诊断为

单选题 男性，48岁，因腹胀、乏力，腹部逐渐增大一个月，而入院治疗，查体:体温36.8℃，消瘦，巩膜轻度黄染，心肺无特殊所见，腹部膨隆呈蛙腹，无压痛及反跳痛，肝未触及，脾于肋下3.0cm，腹水征阳性。腹水常规检查Rivalta试验阳性，白细胞800×10的6次方/L蛋白定量30g/L，腹水葡萄糖定量3.4mmol/L。此腹水的主要形成机制以下列哪个可能性最大? A、肝淋巴液生成过多 B、低白蛋白血症 C、自发性腹膜炎炎症渗出 D、结核性腹膜炎炎症渗出 E、继发性醛固酮增多

单选题HSV-2主要潜伏于

单选题在SLE应用激素冲击疗法中，下列哪项一般不是适应证A．急性肾衰竭B．NP狼疮的癫痫发作C．NP狼疮的明显精神症状D．严重溶血性贫血E．严重血小板减少性紫癜

单选题日本血吸虫成虫可导致

单选题男性，35岁，患肠易激综合征5年，近1个月来排便困难，粪便干结，伴失眠、焦虑。下列不宜选用的治疗药物是( )(2007年)

单选题关于氯霉素引起再生障碍性贫血的说法，下列哪项不正确A．用氯霉素引起的再生障碍性贫血发生率较对照组高6～20倍B．与用药剂量和疗程无关C．多数是不可逆的，即使停止用药，再生障碍性贫血仍继续发展D．可影响骨髓细胞成熟和抑制幼稚细胞增殖E．可能阻滞mRNA的功能

单选题A．尿糖(++++)，酮体阴性B．尿糖(++++)，酮体强阳性C．尿糖阴性，酮体阳性D．尿糖(+)，酮体阳性

单选题男性患者，30岁，近5月来常发上呼吸道感染，乏力、脸色苍白，2周来感病情加重。查体：双下肢散在出血点，巩膜无黄染，肝脾未触及。化验血Hb70g/L，RBC3．0×10 12 /L，WBC3．1×10 9 /L，Plt70×10 9 /L。