单项选择题

A．Look into another passenger’s eyes.
B．Signal you are not a threat to anyone.
C．Keep a distance from other passengers.
D．Avoid eye contact with other passengers.
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disadvantages。
单项选择题
A．They should wait patiently.B．They should ask that man to leave.C．They should serve that man immediately.D．That man is old enough to order things he likes.
A．They should wait patiently.
B．They should ask that man to leave.
C．They should serve that man immediately.
D．That man is old enough to order things he likes.
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