(commerce)<br>Private aircraft carry so few people that they are 5 to 14 times more polluting than _____

(commerce)
Private aircraft carry so few people that they are 5 to 14 times more polluting than ______ planes,per passenger.

(commerce)
Private aircraft carry so few people that they are 5 to 14 times more polluting than ______ planes,per passenger.
【正确答案】：commercial

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