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【单选题】
What does the author mean by 'Aviation has been incompletely deregulated' (para. 3)?
A.
Governmental restrictions are still imposed on aviation industry in many areas.
B.
Governments help establish rules for aviation industry only in America and Europe.
C.
Some countries hope to help their national carriers keep up their national prestige.
D.
Many countries discourage merger plans between foreign and domestic carriers.
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参考解析：
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