单项选择题

According to the author, the deeper problems of aviation industry ______.

A．are the effects of various disasters
B．are actually not fully recognized
C．are attracting a lot of attention
D．are not the real cause of airlines' bankruptcy
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单项选择题
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.
单项选择题
One of the facts that reflect the primitiveness of airline industry is ______.
A．its history is much longer than that of car industry
B．it is composed of international and 'domestic carriers
C．its market is divided by many a relatively small carrier
D．it is still an industry of comparatively low profits
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