单项选择题

A．Free round tickets.
B．Airline credit.
C．Ticket discounts.
D．Membership card.
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S5.Why is it important for managers to increase the part of investment in education
单项选择题
A．Mechanic problems.B．The weather.C．The fact that the crew is not ready.D．The fact that the flight is overbooked.
A．Mechanic problems.
B．The weather.
C．The fact that the crew is not ready.
D．The fact that the flight is overbooked.
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