There is no jet traffic at Washington’s National Airport from 11pm to 7am because ______. What is NOT mentioned in the passage?

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问题 There is no jet traffic at Washington’s National Airport from 11pm to 7am because ______.
What is NOT mentioned in the passage?

选项 A、Psychological strain.
B、Handling capacity of cargo.
C、Measures for noise reduction.
D、Public pressures.

答案A

解析
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