单选题关于夜间阵发性呼吸困难发生的可能机制，以下哪一项是错误的

单选题下列关于吸入性肺脓肿好发部位的叙述，不正确的是

单选题肺源性心脏病患者处于急性加重期。因呼吸微弱，应用气管插管及人工辅助呼吸器。3小时后PaO 2 自40mmHg升至80mmHg，PACO 2 自75mmHg降至25mmHg。pH7.55，BE-0.5。应考虑

单选题女性。28岁，妊娠28周，多次餐后尿糖(+)，糖化血红蛋白6％，无糖尿病症状。为确定此病人有否糖尿病，首选下列哪项检查

单选题A．肩胛间区、胸骨旁、上腹部可闻及血管杂音B．大量蛋白尿C．尿中白细胞、脓细胞较多，且有尿频、尿急史D．满月脸，多毛E．发作时血压骤升伴剧烈头痛，心悸，不发作时血压可正常

单选题治疗肺结核大咯血首选

单选题下列有关貅结核的描述，哪项是错误的( )(1996年)

单选题下述哪种情况下查体时会出现“三凹征”

单选题 男性，50岁，甲亢患者，甲状腺Ⅱ度肿大，有房颤。经丙基硫氧嘧啶治疗3个月后，甲状腺未缩小，房颤未消失。此病治疗应 A、继续原有治疗 B、继续原治疗＋心得安 C、继续原治疗＋地高辛 D、改用放射性131I治疗 E、改用手术治疗

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