题目内容
Passengers could change their seats freely.
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Passengers should watch the safety demonstration and read the safety instruction leaflet carefully in order to deal with any emergency that may occur during flight.
An adult should help his child wear the oxygen mask before attending to himself.
It is necessary for passengers to fasten their seat belts only when there is turbulence during flight.
Oxygen masks for pilots will last longer than those for the passengers.
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