单项选择题

Video games have become increasingly realistic, especially those involving armed combat. America’s armed forces have even used video games (1) recruitment and (2) tools. But the desire to play games is not the (3) why the United States Air Force recently (4) a procurement request for 2,200 Sony PlayStation 3 (PS3) video-game consoles. It intends to link them (5) to build a supercomputer that will (6) 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 (7) a cluster of 336 PS3s.
This is merely the latest example of a(n) (8) trend. There is a long tradition of technology developed for military use filtering (9) to consumer markets: satellite-navigation systems (10) to guide missiles can also help hikers find their way, and head-up displays have (11) from jet fighters to family cars. But technology is increasingly moving in the other (12) , too, as consumer products are (13) for military use.
Traditionally the military has preferred to develop and control its own technology, not just for tactical advantage but also to (14) that equipment was tough and (15) enough for those whose lives would depend on it. That began to change after the cold war as defence budgets became (16) and the development of (17) industrial and consumer products accelerated. As some of these technologies have become commoditized products which are (18) to everyone—friend and foe alike—there seems less (19) 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 (20) when necessary.

20（）

点击查看答案&解析