gers
B. it is more comfortable to sit in the back of jet planes
C. business travelers dislike tourists
D. only by specializing in cheap flights can airlines avoid bankruptcy.
14. In Paragraph 5. “in-flight service" means .
A. Service on the plane
B. A new safety device
C. Flights within one country
D. Charge-free air service
15. The following are all used to attract passengers except .
A. punctuality
B. sound system
C. free drinks
D. charge-free food
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