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外语
A、Commercial aircraft is guided by GPS. B、Civilian aircraft are free to move over all territories. C、Cargo carders no longer col
A、Commercial aircraft is guided by GPS. B、Civilian aircraft are free to move over all territories. C、Cargo carders no longer col
admin
2011-01-08
71
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、Commercial aircraft is guided by GPS.
B、Civilian aircraft are free to move over all territories.
C、Cargo carders no longer collide with one another.
D、Passenger flights are safe to fly with military aircrafts.
答案
B
解析
1) 掌握解释某事物的表达法,如本文中解释free flight时,使用了in which定语从句结构;2) 要透过表面解释,根据上下文深入理解某一概念。选项B就是使用了free flight的字面含义来诱导听者。
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