2. 外语
  3. There is no jet traffic at Washington’s National Airport from 11pm to 7am because ______. The author of the passage in concerne

There is no jet traffic at Washington’s National Airport from 11pm to 7am because ______. The author of the passage in concerne

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问题 There is no jet traffic at Washington’s National Airport from 11pm to 7am because ______.
The author of the passage in concerned primarily with ______.
选项 A、the effects of noise on the quality of life
B、the role of air traffic restrictions
C、the production of quieter engines
D、the economic aspects of noise reduction
答案D
解析
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