单选题 人胚第四周时，胚体头部间充质增生形成6对鳃弓，其中哪两对鳃弓发育出现障碍时，可出现各种外耳畸形（ ） A、第一、二鳃弓 B、第二、三鳃弓 C、第三、四鳃弓 D、第四、五鳃弓 E、第五、六鳃弓

单选题腹部手术后病人出现呼吸困难、发绀、呼吸音减弱或消失，应首先考虑（ ）

单选题A．缺血性骨坏死B．缺血性肌挛缩C．慢性骨萎缩D．关节僵硬

单选题确诊膝关节滑膜结核时，以下哪项最可靠

单选题不符合弥漫性毛细血管内增生性肾小球肾炎尿液变化的是

单选题输尿管结石最易停留的部位是

单选题下述哪种情况骨折愈合好

单选题A．骨擦音或骨擦感B．血压降低C．持续高热D．功能障碍

单选题各种分流术中，发生肝性脑病较多的是

单选题It's seven weeks into the new year. Do you know where your resolution is? If you're like millions of Americans, you probably vowed to lose weight, quit smoking and drink less in the new year. You kicked off January with a commitment to long-term well-being--until you came face-to-face with a cheeseburger. You spent a bundle on a shiny new gym pass. Turns out, it wasn't reason enough for you to actually use the gym. People can make poor decisions when it comes to health--despite their best intentions. It's not easy abiding by wholesome choices (giving up French fries) when the consequences of not doing so (heart disease) seem so far in the future. Most people are bad at judging their health risks: smokers generally know cigarettes cause cancer, but they also tend to believe they're less likely than other smokers to get it. And as any snack-loving dieter can attest, people can be comically inept at predicting their future .behavior. You swear you will eat just one potato chip but don't stop until the bag is empty. So, what does it take to motivate people to stick to the path set by their conscious brain? How can good choices be made to seem more appealing than bad ones? The problem stumps doctors, public-health officials and weight-loss experts, but one solution may spring from an unlikely source. Meet your new personal trainer: your boss. American businesses have a particular interest in personal health, since worker illness costs them billions each year in insurance claims, sick days and high staff turnover. A 2008 survey of major US employers found that 64% consider their employees' poor health decisions a serious barrier to affordable insurance coverage. Now some companies are tackling the motivation problem head on, using tactics drawn from behavioral psychology to nudge their employees to get healthy. "It's a bit paradoxical that employers need to provide incentives for people to improve their own health," says Michael Follick, a behavioral psychologist at Brown University and president of the consultancy Abacus Employer Health Solutions. Paradoxical, maybe, but effective. Consider Amica Mutual Insurance, based in Rhode Island. Arnica seemed to be doing everything right: it boasts an on-site fitness center at its headquarters. It pays toward Weight Watchers and smoking-cessation help, gives gift cards to reward proper prenatal care and offers free flu shots each year. Still, in the mid-2000s, about 7% of the company's insured population, including roughly 3 100 employees and their dependents, had diabetes. "We manage risk. That's our core business," says Scott Boyd, Amica's director of compensation and benefits. But diabetes-related claims from Arnica employees had doubled in four years. "We thought, OK," Boyd says now, "we have to manage these high-risk groups a little better. /

单选题男，71岁，排尿困难伴尿急、尿痛3年，近1个月尿滴沥，夜尿7～8次。查体：下腹部叩诊浊音；右腹股沟区见可回纳性包块，首先应进行的检查是

单选题肝包虫囊肿一旦确定后，应特别检查身体的哪个部位有无包虫囊肿存在

单选题恶性骨肿瘤的X线表现主要为

单选题A．Vollcmann缺血挛缩B．创伤性关节炎C．关节僵硬D．脂肪栓塞E．骨化性肌炎(损伤性骨化)

单选题肠息肉中，很少癌变的是

单选题急性胰腺炎的发病原因在中国主要是

单选题垂体加压素止血机理中，下列哪项不恰当的

单选题下列不符合卵巢无性细胞瘤的描述是

单选题前哨痔是指

单选题男性，72岁，体重50kg，因胃癌进行手术治疗。为补充术中失血，给予输注全血。当全血输注至1000ml时，患者突然出现呼吸困难，咳嗽，肺部湿性啰音，脉搏130／分，血压160／90mmHg。患者很可能发生了