单项选择题

A．Wars or natural disasters make them lose their families.
B．They want to help their families earn enough money to survive.
C．They are poor.
D．All the above.
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单项选择题
A．Taking the air.B．By plane.C．On radio and TV.D．At the airport.
A．Taking the air.
B．By plane.
C．On radio and TV.
D．At the airport.
单项选择题
A．It can reduce the number of passenger complaints.B．It can make air travel more entertaining.C．It can cut down the expenses for air travel.D．It can lessen the discomfort caused by air travel.
A．It can reduce the number of passenger complaints.
B．It can make air travel more entertaining.
C．It can cut down the expenses for air travel.
D．It can lessen the discomfort caused by air travel.
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