单选题A．腺体和间质增生B．增生的腺体密集排列C．增生的腺体密集排列．伴腺上皮异型性D．腺体密集伴腺上皮异型性显著。间质浸润

单选题There's nothing simple about gun control, a tangle of legal, political and public-health issues complicated by cultural preferences and regional biases. Passions run high on all sides. Lifelong hunters whogrew up with firearms, urban victims of gun violence, Second Amendment scholars, NRA lobbyists, chiefs of police—they've all got cases to make and they make them well, often contentiously. For the past 15 years, much of the debate has centered on the effectiveness of the Brady Handgun Violence Prevention Act, the federal gun-control bill that was passed in 1993. Critics say the focus on law-abiding gun buyers doesn't address the real issue—bad guys who acquire their weapons illegally. Supporters say that the bill stops thousands of illegal gun purchases and deters crime and violence. Now medical research has come to the rescue, sifting through the data to figure out which legal measures work best to reduce firearm suicides and homicides. In a paper published in the May issue of the American Journal of Preventive Medicine, Steven Sumner, a third-year med student and Dr. Peter Layde, codirector of the Injury Research Center at the Medical College of Wisconsin, found that local background checks, which are optional and used by just a handful of states, were more effective than the federal background checks mandated by the Brady law. The report compared the homicide and suicide rates in states that perform only federal checks with states that do state-level checks and those that perform local-level checks. The local-level checks were associated with a 27 percent lower firearm suicide rate and a 22 percent lower homicide rate among adults 21 and older, the legal age to purchase a gun. Why are local checks so much better? "We hypothesize that it's due to access to additional information that's not available at the federal checks," says Layde, "particularly related to mental-health issues and domestic-violence issues." All 50 states use the National Instant Criminal Background Check System (NICS), the minimum required under Brady, while 17 states also perform state-level checks and 12 do additional local-level checks. "This is the first study that's looked at this issue," says Layde. "If the magnitude of impact we found were in fact to apply to all 50 states, you would expect a very substantial reduction in suicides and homicides linked to firearms, many thousands. " However, background checks can be both an administrative and a cost burden for strapped and stretched local authorities. There is another way to get the same results., improve the flow of local information to the NICS databases. "In an ideal world," says Layde, "you might not have to have the local agencies involved if you just reliably got all the data they had up to the federal level. /

单选题The terms college and university originally had very similar meanings. Only (1) the passing of centuries did "university" come to (2) an educational (3) composed of more than one college. During the Middle Ages students (4) the universities of Paris, Oxford, and Cambridge found (5) convenient to rent houses and share expenses (6) living in private apartments. By the 13th century these "houses of scholars" were becoming legally recognized corporate institutions. At Oxford the earliest of these (7) were University College, (8) in 1249 by William of Durham; Balliol College, founded by John Balliol in 1263; and Merton College, founded about 1264 by Walter de Merton. A similar (9) took place at Cambridge. In the United States the word college most commonly (10) to four-year institutions that (11) students from secondary schools and grant a bachelor's (12) after a general (13) of studies. A college may also be a school (14) specialized training that takes place after (15) the bachelor's degree--such as a college of law or medicine. Schools (16) in theological training may be called seminaries or schools instead of colleges. A university normally (17) of a group of colleges--one for the liberal arts or general studies and (18) for engineering, law, medicine, education, and (19) . Some of these colleges are for advanced study, (20) the college of liberal arts is the institution in which one earns a bachelor's degree.

单选题A．血C3正常B．血C3在疾病活动期下降C．血C3持续降低D．血C3在起病初期下降，8周内恢复正常

单选题胃大部切除术后吻合口溃疡为一严重的并发症，90%以上发生在（ ）

单选题下列关于破伤风梭菌特点的叙述，错误的是( )(2007年)

单选题急性阑尾炎病人，当腹痛尚未转移至右下腹前，在诊断上具有重要意义的是A．已出现发热B．已有白细胞显著升高C．已有脐区压痛及反跳痛D．脐区及有下腹均有压痛、反跳痛E．压痛已固定在右下腹

单选题A．溶血性链球菌B．厌氧性细菌C．两者均可D．两者均不可 (1999年)

单选题早期肝癌，目前最有效的治疗方案是（ ）

单选题有关胸部外伤，下列哪项是恰当的

单选题男性，50岁，上腹不适，食欲不振3个月。1个月来出现黄疸进行性加重，有体重减轻，全身明显黄染，肝未触及，深吸气时可触到肿大胆囊底部，无触痛。化验血胆红素15mg/dl，尿检胆红素阳性。最可能是A．肝炎B．胆石症C．胰头癌D．慢性胰腺炎E．肝癌

单选题A．狼疮性肾炎B．高尿酸血症肾病C．肾淀粉样变性D．糖尿病性肾病E．原发性肾小球肾炎

单选题下列哪一项是前列腺增生最早出现的症状（ ）

单选题男，48岁。慢性胆囊炎多年，近10天寒战、高热，伴肝区疼痛。血常规示：WBC 17.1 ×10 9 ／L；AFP115mg／L；B超示左肝区5cm ×5cm液性暗区，胆囊增大，壁厚，腹腔有少量积液。此病最可能的诊断是

单选题下列预防和治疗术后肺不张的措施中，哪项是不恰当的A．鼓励咳痰B．防止呕吐C．术前锻炼深呼吸D．术后胸、腹部切口应紧紧固定或绑扎E．减少肺泡和支气管内分泌物增多，如术前2周应禁烟

单选题下列关于胆道系统的叙述，错误的是A．胆汁全部南肝细胞分泌B．胆囊24小时可接纳胆汁500mlC．促进胆汁分泌最强的是促胰液素D．成人每日分泌胆汁约800～1200mlE．毛细胆管再调节胆汁流量和成分方面起关键作用

单选题绞窄性腹股沟斜疝行坏死肠管切除后的治疗方法是

单选题诊断为肠梗阻后，极为重要的是必须明确

单选题结石位于输尿管膀胱壁段常有

单选题下列哪项不符合原发性甲亢的诊断标准