There is no jet traffic at Washington’s National Airport from 11pm to 7am because ______. Noise reduction could lead to ______.

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问题 There is no jet traffic at Washington’s National Airport from 11pm to 7am because ______.
Noise reduction could lead to ______.

选项 A、increased airport capacity
B、lower property values
C、effective modification of existing jet engines
D、more transportation costs to and from airports

答案A

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