单项选择题


A．suggesting
B．pr6dicting
C．exposing
D．defining
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单项选择题
The following arc all used to attract passengers EXCEPT ______.
A．punctuality
B．sound system
C．free drinks
D．charge-free food
单项选择题
In Paragraph 5, in-flight service means ______.
A．charge-free air service
B．a new safety device
C．service on the plane
D．flights within one country
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