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  3. Video games have become increasingly realistic, especially those involving armed combat. America’ s armed forces have even used

Video games have become increasingly realistic, especially those involving armed combat. America’ s armed forces have even used

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问题     Video games have become increasingly realistic, especially those involving armed combat. America’ s armed forces have even used video games 【B1】______ recruitment and 【B2】______ tools. But the desire to play games is not the 【B3】______ why the United States Air Force recently 【B4】______ a procurement request for 2,200 Sony PlayStation 3 (PS3) video-game consoles. It intends to link them 【B5】______ to build a supercomputer that will【B6】______Linux, a free, open-source operating system. It will be used for research, including the development of high-definition imaging systems for radar, and will cost around one-tenth as much as a conventional supercomputer. The air force has already built a smaller computer 【B7】______ a cluster of 336 PS3s.
    This is merely the latest example of a (n) 【B8】______ trend. There is a long tradition of technology developed for military use filtering 【B9】______ to consumer markets: satellite-navigation systems【B10】______to guide missiles can also help hikers find their way, and head-up displays have【B11】______from jet fighters to family cars. But technology is increasingly moving in the other【B12】______, too, as consumer products are【B13】______for military use.
    Traditionally the military has preferred to develop and control its own technology, not just for tactical advantage but also to【B14】______that equipment was tough and【B15】______enough for those whose lives would depend on it. That began to change after the cold war as defence budgets became【B16】______and the development of【B17】______industrial and consumer products accelerated. As some of these technologies have become commoditised products which are【B18】______to everyone—friend and foe alike—there seems less【B19】______not to buy them and use the savings for more critical equipment that needs to be built-to-order. And consumer products can often be tweaked to make them more rugged or【B20】______when necessary.
【B7】
选项 A、for
B、as
C、from
D、into
答案C
解析 考查介词辨析。根据语境可知，此处表达的意思为：小型计算机是来自这336台PS3的，因此答案为C．from。其他三项均不符合题意。
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