单项选择题
A．they are outdated B．they need to be oiled C．they become worn out D．they are easily available
A．All the members enjoy equal benefits B．Ivory is the starting membership level. C．Fliers can choose any membership level. D．VIP rooms are only for the Platinum level.
A．pay their membership fees regularly B．fly overseas at least once every year C．take a domestic flight with Air France once a month D．pay for their flight at least once within twenty months