单项选择题


A．movement
B．temperature
C．pressure
D．speed
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单项选择题
From the passage we can infer that ______.
A．a successful airline in the 1980s meets the needs not only of the masses but also of the wealthy passengers
B．it is more comfortable to sit in the back of jet planes
C．business travelers dislike tourists
D．only by specializing in cheap flights can airlines avoid bankruptcy
单项选择题
In Paragraph 5, in-flight service means ______.
A．charge-free air service
B．a new safety device
C．service on the plane
D．flights within one country
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