单项选择题

One disadvantage of alliances foreseen by the critics is that air travel may be more expensive as a result of______.

A．less convenience
B．higher operation costs
C．less competition
D．more joint marketing
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单项选择题
Which of the following is Not a perceived advantage of alliances
A．Baggage allowance.
B．Passenger Comfort
C．Convenience.
D．Quality
单项选择题
As the story proceeds, March begins to feel under the spell of______.
A．the light
B．the trees
C．the night
D．the fox
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