单选题The idea is as audacious as it altruistic: provide a personal laptop computer to every schoolchild -- particularly in the poorest parts of the world. The first step to making that happen is whittling the price down to $100. And that is the goal of a group of American techno-gurus led by Nicholas Negroponte, the founder of the fabled MIT Media Lab. When he unveiled the idea at the World Economic Forum in January it seemed wildly ambitious. But surprisingly, it is starting to become a reality. Mr. Negroponte plans to display the first prototype in November at a UN summit. Four countries -- Brazil, Egypt, Thailand and South Africa -- have said they will buy over I m units each. Production is due to start in late 2006. How is the group, called One Laptop Per Child (OLPC), able to create a laptop so inexpensively? It is mainly a matter of cleverly combining existing technologies in new ways. The laptop will have a basic processor made by AMD, flash memory instead of a hard disk, will be powered by batteries or a hand-crank, and will run open-source software. The $100 laptop also puts all the components behind the screen, not under the keyboard, so there is no need for an expensive hinge. So far, OLPC has got the price down to around $130. But good news for the world's poor, may not be such great news for the world's computer manufacturers. The new machine is not simply of interest in the developing world. On September 22nd, Mitt Romney, the governor of Massachusetts, said the state should purchase one for every secondary-school student, when they become available. Sales to schools are just one way in which the $100 laptop could change the computer industry more broadly. By depressing prices and fuelling the trend for "good-enough computing", where customers upgrade less often, it could eventually put pressure on the world's biggest PC-makers.

单选题 胎盘分泌的hCG的作用是（ ） A、促进卵泡生长 B、促进排卵 C、促进卵母细胞成熟分裂 D、促进黄体生长 E、促进子宫平滑肌松弛

单选题尿道结石的主要症状是

单选题男，40岁，B超发现膀胱左后壁有3cm×3cm大小憩室，其内有2cm×1cm的结石，选择治疗的方法是

单选题外科感染严重的症状是（ ）

单选题A．排便可加重肛门疼痛，伴大便带鲜血B．肛周肿痛伴发热C．反复发作的肛周红肿疼痛，窦道外口流出脓性分泌物D．肛门疼痛，伴有局部暗紫色肿块E．排便时出血、无痛

单选题深部脓肿的临床表现是

单选题 对于颅内肿瘤，目前最常用的化学药物是 A、噻替胍 B、5-氟脲嘧啶 C、争光霉素 D、环已亚硝脲 E、环磷酰胺

单选题抑制素的化学性质是

单选题慢痛的传入纤维是

单选题与子宫内膜癌关系最密切的是

单选题下列哪些情况下，口服胆囊造影时，胆囊不显影

单选题甲亢术后出现声音嘶哑，饮水无呛咳，可能是由于

单选题下列选项中，不属于膜性肾小球肾炎电镜下特点的是

单选题 下列哪种说法是错误的（ ） A、新生儿衣原体性结膜炎可用1％硝酸银滴眼，同时红霉素50mg/kg口服，预防衣原体性肺炎的发生 B、支原体感染是机会感染，常伴有其他致病菌感染 C、淋球菌检查取材后应立即接种，离体时间越短越好 D、避孕套可以避免单纯疱疹病毒感染 E、滴虫性阴道炎的发病率为10/%~25％

单选题根据尿素氮测定值来判断，下列哪项属于中度肾功能损害

单选题男性，35岁，一周前鼻部出现一疖，3日前不慎受挤压而加重。查体：体温38℃；脉率90次／分；两眼周围均红肿，鼻部疖附近更甚。局部不压时不痛。病人神志清楚，配合治疗。血白细胞计数12×10 9 ／L。应考虑已并发

单选题口底、颌下和颈部的急性蜂窝织炎，可并发

单选题内脏痛对哪些刺激不敏感

单选题A．清洁伤口 B．沾染伤口C．感染伤口 D．二期愈合E．一期愈合