There is no jet traffic at Washington’s National Airport from 11pm to 7am because ______. "The current state of the art"(in Par

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问题 There is no jet traffic at Washington’s National Airport from 11pm to 7am because ______.
"The current state of the art"(in Para. 2) means ______.

选项 A、a developed sense of beauty
B、the volume of present-day traffic
C、the most recently developed technology
D、insulation of air traffic noise

答案C

解析
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