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单选题
According to Nigel most problems of air travel are caused by
A．unfavourable weather conditions．
B．airports’ handling capacity．
C．inadequate ticketing service．
D．overbooking．
According to Nigel most problems of air travel are caused by
A．unfavourable weather conditions．
B．airports’ handling capacity．
C．inadequate ticketing service．
D．overbooking．
A．Free ticke
B．Free phone cal
C．Cash rewar
D．Seat reservatio
A．Because all flights in and out of there are ful
B．Because the volume of traffic is heav
C．Because there are more popular flight
D．Because there are more delays and cancellation