单选题A．肝细胞核因子-1α B．肝核因子-4αC．胰岛素受体 D．神经源性生长因子1E．葡萄糖激酶
单选题A、慢支 B、支气管哮喘 C、肺TB D、支气管扩张 E、肺癌
单选题A．急性粟粒性肺结核B．急性空洞型肺结核C．局灶型肺结核D．千酪性肺炎 (2009年)
单选题女性，48岁，患扩张型心肌病，6分钟步行测试行走450米。该患者的心功能评级属于
单选题A．手术治疗B．药物治疗C．糖皮质激素治疗D．血管紧张素治疗
单选题A．持续性腹痛B．疼痛-排便-缓解C．进食-疼痛-缓解D．疼痛-进食-缓解
单选题在风湿疾病中，下列哪一种疾病肾脏受累相对较少见
单选题下述有关假小叶的描述中，哪项不正确A．体积大小不等B．肝细胞索排列紊乱C．中央静脉偏位或缺如D．可见汇管区E．肝细胞异型性显著
单选题男，52岁，肝硬化住院，发生肝昏迷，用乳果糖治疗，其作用机制主要是
单选题女性，62岁，患心绞痛3年余，因情绪激动突然发作比以前严重的胸痛，疑为急性心肌梗死，以下哪项最有诊断价值
单选题A．结核菌素试验B．冷凝集试验C．支气管激发试验D．Kveim试验E．Valsalva试验
单选题pH 7．256，PaO
2
55mmHg，PaCO
2
56mmHg，HCO
3
-
24mmoll／L，该患者的酸碱失衡类型为
单选题高血压病合并糖尿病，BPl80／100mmHg，心率65次／分，尿蛋白(+)，血肌酐正常，选用下列哪类药物降压最合适( )(2000年)
单选题下述哪种结核病患者不考虑应用糖皮质激素
单选题结核性胸膜炎和浸润性肺结核均为A．速发型变态反应B．细胞毒型变态反应和依赖抗体细胞毒型变态反应C．免疫复合物型变态反应和细胞刺激型变态反应D．迟发型变态反应E．以上都不对
单选题女性肝硬化患者闭经、不孕是由于
单选题感染结核杆菌后获得的免疫力主要是
单选题扩张型心肌病与心包积液的鉴别主要根据
单选题急性重型肝炎的特点是
单选题Internet advertising is booming. The industry has gone from $ 9.6 billion in revenue in 2001 to $ 27 billion this year, according to Piper Jaffray, an investment bank. And it is still early days. The internet accounts for only 5% of total spending on advertising, but that figure is expected to reach at least 20% in the next few years. The single largest category within this flourishing industry, accounting for nearly half of all spending, is "pay-per-click" advertising, which is used by firms both large and small to promote their wares. The benefits of the pay-per-click approach over traditional advertising (television, radio, print and billboards are obvious. Since advertisers pay only to reach the small subset who actually respond to an advertisement, the quality of the leads generated is very high, and advertisers are prepared to pay accordingly. The price: per click varies from $ 0.10 to as much as $ 30, depending on the keyword, though the average is around $ 0.50. Google made most of its $ 6.1 billion in revenue last year from pay-per-click advertising. But as pay-per-click advertising has grown into a huge industry, concern has mounted over so-called "click fraud"--bogus clicks that do not come from genuinely interested customers. It takes two main forms. If you click repeatedly on the advertisements on your own website, or get other people or machines to do so on your behalf, you can generate a stream of bogus commissions. Click fraud can also be used by one company against another: clicking on a rival firm's advertisements can saddle it with a huge bill. Bogus clicks are thought to account for around 10% of all click traffic, though nobody knows for sure. A few months ago Mr. Gross pioneered an alternative to the pay-per-click model. In February, Snap, a search engine backed by Mr. Gross, launched "pay-per-action" (PPA), a new model in which advertisers pay only if a click on an ad is followed by an action such as a purchase or a download. Might this put an end to click fraud? Don't bet on it, says Mike Zeman at Starcom, an advertising agency. Payper-action will be a niche, he predicts, since converting a click into an action depends on a variety of factors such as the ease of use of the advertiser's website. Google and its peers will be reluctant to be so dependent on factors outside their control. But Mr. Tobaccowala thinks pay-per-action could become a real alternative to pay-per-click. As bigger companies spend more on internet advertising; they will demand more accountability and a wider range of options, he says. At the very least, that means clamping down on click fraud; but it also presents an opportunity for entrepreneurs to invent new models that are less vulnerable to abuse.