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单选题If you are a tourist interested in seeing a baseball game while in New York, you can find out which of its teams are in town simply by sending a message to AskForCents.com. In a few minutes, the answer comes back, apparently supplied by a machine, but actually composed by a human. Using humans to process information in a machine-like way is not new: it was pioneered by the Mechanical Turk, a famed 18th-century chess-playing machine that was operated by a hidden chessmaster. But while computers have since surpassed the human brain at chess, many tasks still baffle even the most powerful electronic brain. For instance, computers can find you a baseball schedule, but they cannot tell you directly if the Yankees are in town. Nor can they tell you whether sitting in the bleachers is a good idea on a first date. AskForCents can, because its answers come from people. "Whatever question you can come up with, there's a person that can provide the answer—you don't have the inflexibility of an algorithm-driven system," says Jesse Heitler, who developed AskForCents. Mr. Heitler was able to do this thanks to a new software tool developed by Amazon, the online retailer, that allows computing tasks to be farmed out to people over the internet. Aptly enough, Amazon's system is called Mechanical Turk. Amazon's Turk is part toolkit for software developers, and part online bazaar: anyone with intemet access can register as a Turk user and start performing the Human Intelligence Tasks (HITs) listed on the Turk website (mturk.com). Companies can become "requesters by setting up a separate account, tied to a bank account that will pay out fees, and then posting their HITs. Most HITs pay between one cent and $5. So far, people from more than 100 countries have performed HITs, though only those with American bank accounts can receive money for their work; others are paid in Amazon gift certificates. Mr. Heitler says he had previously tried to build a similar tool, but concluded that the in-frastucture would be difficult to operate profitably. Amazon already has an extensive software infrastructure designed for linking buyers with sellers, however, and the Turk simply extends that existing model. Last November Amazon unveiled a prototype of the system, which it calls "artificial artificial intelligence". The premise is that humans are vastly superior to computers at tasks such as pattern recognition, says Peter Cohen, director of the project at Amazon, so why not let software take advantage of human strengths? Mr. Cohen credits Amazon's boss, Jeff Bezos, with the concept for the Turk. Other people have had similar ideas. Eric Bonabeau of Icosystem, an American firm that builds software tools modeled on natural systems, has built what he calls the "Hunch Engine" to combine human intelligence with computer analysis. The French postal service, for example, has used it to help its workers choose the best delivery routes, and pharmaceutical researchers are using it to determine molecular structures by combining their gut instincts with known results stored in a database. And a firm called Seriosity hopes to tap the collective brainpower of the legions of obsessive players of multiplayer online games such as "World of War-craft ", by getting them to perform small real-world tasks (such as sorting photographs) while playing, and paying them in the game's own currency.

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单选题长期高血压，心脏的组织学改变是 A．心肌纤维增殖 B．心肌纤维肥大 C．心肌淀粉样变性 D．心肌形成瘢痕 E．间质脂肪浸润

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单选题关于血栓形成的叙述，哪项是错误的?

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单选题生成红细胞的原料包括( ) A．铁和蛋白质 B．促红细胞生成素 C．维生素B12 D．叶酸 E．内因子

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单选题Rh血型的主要抗体是( )(2012年)

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单选题肺淤血时，痰中出现胞浆含有含铁血黄素的巨噬细胞称为( )(1989年)

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单选题A．氨基酸B．脂肪酸C．胆盐D．果糖E．纤维素

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单选题A．淋巴细胞B．浆细胞C．中性粒细胞D．嗜酸性粒细胞

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