单选题B型胃炎主要的发病原因是

单选题A．二尖瓣狭窄 B．二尖瓣关闭不全C．主动脉瓣狭窄 D．主动脉瓣关闭不全

单选题关于重型肝炎的治疗，下面哪一项是正确的

单选题A．血清铁降低，血清铁蛋白升高，转铁蛋白饱和度降低B．血清铁升高，血清铁蛋白升高，转铁蛋白饱和度升高C．血清铁降低，血清铁蛋白升高，转铁蛋白饱和度升高D．血清铁降低，血清铁蛋白降低，转铁蛋白饱和度降低

单选题Remember Second Life, the virtual world that was supposed to become almost as important as the first one? Now populated by no more than 84,000 avatars at a time, it has turned out to be a prime example of how short-lived Internet fads can be. Yet if many adults seem to have given up on virtual worlds, those that cater to children and teenagers are thriving. Several have even found a way to make money. In America, nearly 10 million children and teenagers visit virtual worlds regularly, estimates eMarketer, a market researcher-a number the firm expects to increase to 15 million by 2013．As in January, there were 112 virtual worlds designed for under-18s with another 81 in development, according to Engage Digital Media, a market research firm. All cater to different age groups and tastes. In Club Penguin, the market leader, which was bought by Disney in 2007 for a whopping $ 700 million, primary-school children can take on a penguin persona, fit out their own igloo and play games. Habbo Hotel, a service run from Finland, is a global hangout for teenagers who want to customise their own rooms and meet in public places to attend events. Gala Online, based in Silicon Valley, offers similar activities, but is visited mostly by older teens who are into Manga comics. Not a hit with advertisers, these online worlds earn most of their money from the sale of virtual goods, such as items to spruce up an avatar or a private room. They are paid for in a private currency, which members earn by participating in various activities, trading items or buying them with real dollars. This sort of stealth tax seems to work. At Gala Online, users spend more than $1 million per month on virtual items, says Craig Sherman, the firm's chief executive. Running such a virtual economy is not easy, which is why Gaia has hired a full-time economist to grapple with problems that are well known in the real world, such as inflation and an unequal distribution of wealth. There are other barriers that could limit the growth of virtual worlds for the young, but the main one is parents. Many do not want their offspring roaming virtual worlds, either because they are too commercial or are thought to be too dangerous. Keeping them safe is one of the biggest running costs, because their sponsors have to employ real people to police their realms. Youngsters are also a fickle bunch, says Simon Levene of Accel Partners, a venture- capital firm. Just as children move from one toy to another, they readily switch worlds or social networks, often without saying goodbye. Even so, Debra Aho Williamson, an analyst at eMarketer, believes "these worlds are a training ground for the three-dimensional web". If virtual worlds for adults, which so far have been able to retain only hardcore users, manage to hang on for a few years, they may yet have a second life.

单选题血液中CO2的主要运输形式是 A.物理溶解 B.氨基甲酰血红蛋白 C.碳酸氢盐 D.氧合血红蛋白

单选题男性，72岁，持续胸痛伴呕吐、大汗6h，血压80／50mmHg，窦性心律，45bpm，心电图示下壁和右室梗死，不合理的处置是

单选题治疗阿米巴肝脓肿和阿米巴痢疾的首选药物是 ( )

单选题A．生长激素B．甲状腺激素C．两者都是D．两者均否

单选题 引起肾盂肾炎最多见的细菌是 A、变形杆菌 B、绿脓杆菌 C、大肠杆菌 D、肠球菌 E、葡萄球菌

单选题下列关于高血压所致靶器官并发症的叙述，错误的是A．血压急剧高可形成脑部小动脉的微动脉瘤B．高血压脑病的临床表现在血压降低后可逆转C．是促使冠状动脉硬化的病因之一D．长期持久高血压可致进行性肾硬化E．严重高血压可并发主动脉夹层

单选题下列与感染相关的风湿病是( )(2012年)

单选题男性，66岁，3年前患前壁心肌梗死，1年前诊断为慢性心力衰竭，左室射血分数33％。患者平时无症状，应当长期服用的药物不包括

单选题结核性腹膜炎病人的发热特点错误的是( )(2002年)

单选题心绞痛进食过饱的严重后果是（ ）

单选题A．胰岛素 B．高血糖素 C．胰多肽 D．生长抑素

单选题 葡萄糖酸锑钠对杜氏利什曼原虫有很强的杀虫作用，在用药过程中当出现哪种不良反应时宜暂停治疗 ( ) A、鼻出血 B、腹痛、腹泻 C、脾区痛 D、发热、恶心、呕吐 E、血中白细胞继续减少

单选题Something extraordinary is happening in London this week: in Lambeth, one of the city's poorest boroughs(区), 180 children are starting their secondary education in a brand new school. The state- funded school was set up by parents who were fed up with the quality of local education. In countries with more enlightened education systems, this would be unremarkable. In Britain, it is an amazing achievement by a bunch of desperate and determined people after years of struggle. Britain's schools are in a mess. Average standards are not improving despite billions in extra spending, and a stubbornly long tail of underachievers straggles(拖后腿) behind. A couple of years ago, a consensus emerged among reformers that councils had too much control and parents too little. One might have expected more from the Conservatives, who stood for election on a pledge to bring in school vouchers. Yet the Tory policy group charged with thinking deep thoughts about public services paid only lip service to parent power in its report. Where schools are failing, it said, parents or charities should get taxpayers 'money to open new ones. But only 2.9% are actually failing, on official definitions. And another proposal, that children in failing schools get extra funding if they go elsewhere, was so lacking in detail as to be meaningless. Worry about underperforming schools is hardly confined to Britain: in America, in Italy, in Germany, even in once-proud France education is a hot-button topic. Yet a number of countries seem to have cracked it. Although specific problems differ in different societies, parental choice is at the heart of most successful solutions. What are the lessons? The first is that if a critical mass of parents wants a new school and there is a willing provider, local government should be required to finance it as generously as it does existing state schools. The second is that if a charity wants to open a school in the hope that children will come, then taxpayers' money should follow any that do. Third, rules about what, where and how schools teach should be relaxed to avoid stifling innovation and discouraging newcomers with big ideas. In any event, public-examination results would give parents the information they needed to enforce high standards. These proposals may seem radical, yet parents in the Netherlands have had the right to demand new schools since 1917, and those in Sweden have been free since 1992 to take their government money to any school that satisfies basic government rules. In the Netherlands 70% of children are educated in private schools at the taxpayers' expense; in Sweden 10% already are. In both countries state spending on education is lower per head than in Britain, and results are better. It doesn't take a genius IQ -- just a little political courage -- to draw the correct conclusion.

单选题A．DA方案B．MP方案C．CHOP方案D．ABVD方案E．VDLP方案

单选题 女性，64岁。因急性下壁、右室梗死急诊入院。心电监测示三度房室传导阻滞，心室率34次／分，BP 80/50mmHg。处理的最佳方案是： A、地塞米松 B、植入临时人工心脏起搏器 C、多巴胺 D、肾上腺素 E、阿托品