4. What may be inferred about the airline industry?
(A) It is responsible for about 11 percent of greenhouse gases.
(B) It is extremely sensitive to costs, such as fuel.
(C) It is making more profit with purchase of new aircrafts.
(D) It is quickly declining because of low profitability.
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有關航空業的推論？（A）約佔11％的溫室...
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4. What may be infe...
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