单项选择题

One disadvantage of alliances foreseen by the critics is that air travel may be moreexpensive 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
According to the passage, which of the following categories of travellers will gainmost from airline alliances
A．Travellers who fly frequently economy class.
B．Travellers who fly frequently business class.
C．Travellers who fly occasionally during holidays.
D．Travellers who fly economy class once.in a while.
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