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A、To improve navigation for warplanes and warships. B、To guide smart bombs that home in on moving targets. C、To collect meteorol
A、To improve navigation for warplanes and warships. B、To guide smart bombs that home in on moving targets. C、To collect meteorol
admin
2006-07-14
74
问题
The Global Positioning System (GPS) has become indispensable for soldiers, pilots, hikers, yachtsmen, even bankers, ever since the U.S. Department of Defense started filling the sky with satellites about 25 years ago, in order to improve navigation for fighters, bombers and warships. More recently, GPS has allowed the development of precision-guided weapons, the smart bombs that home in on targets: between Serbia four years ago and this year’s Iraq war, the proportion of such bombs used rose from no more than 3 percent to at least 60 percent.
However, the GPS is also an essential prop to countless civil applications; for every military user, there are now 100 civilian users. It provides not only satellite-navigator systems in cars and boats; it is used by Internet service providers, by banks and by surveyors. One day it might be used by air traffic control systems to permit "free flight", in which pilots of commercial aircraft find their own route and stay clear of other aircraft, without the cumbersome business of radio telephone contact with controllers on the ground.
选项
A、To improve navigation for warplanes and warships.
B、To guide smart bombs that home in on moving targets.
C、To collect meteorological data.
D、To sense remote volcanic eruptions.
答案
A
解析
原文第一段中说美国发射卫星的目的是“in order to improve navigation for fighters, bombers and warships”即“为战斗机、轰炸机和战舰导航”,由此可见,选项a的说法与原文相符,是正确答案。
转载请注明原文地址:https://kaotiyun.com/show/BU0O777K
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