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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