单项选择题

A．Their numbers are increasing.
B．They are more capable.
C．They have wisdom.
D．They are good organizers.
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单项选择题
A．$160.B．$150.C．$180.D．$120.
A．$160.
B．$150.
C．$180.
D．$120.
单项选择题
A．She must look after the passengers and do routine work.B．She must fulfill special duties under all situations.C．She must remain calm in case of an emergency.D．She must keep the plane in normal order.
A．She must look after the passengers and do routine work.
B．She must fulfill special duties under all situations.
C．She must remain calm in case of an emergency.
D．She must keep the plane in normal order.
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