The core of disagreement between regulators and airlines is______.
A. how much airlines should charge for extra fees
B. how many charging items should airlines set
C. how often should airlines improve the fee disclosure
D. how open airlines should be about the pricing system
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By referring the report by IdeaWorks, the author intends to______.
A. verify the rationality of setting new rules
B. illustrate the profit composition of airlines
C. explain the change in the past decade
D. reveal the fraud committed by airlines
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