单项选择题

The following arc all used to attract passengers EXCEPT ______.

A．punctuality
B．sound system
C．free drinks
D．charge-free food
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单项选择题
With the intention of attracting a somewhat different type of passengers, the airlines have now begun to concentrate on ______.
A．providing facilities enabling business travelers to work on board
B．ensuring that the facilities offered to the executive are indeed superior
C．organizing activities in which first-class passengers can participate
D．installing sleeping compartments where more privacy is ensured
单项选择题
The phrase in relation to in Line 4 of the second paragraph can be replaced by ______.
A．with reference to
B．connected with
C．according to
D．in comparison with
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