单项选择题
A．On foot and by boat. B．By car and on foot. C．By air and by ear. D．By air and by bus.
A．At a conference hall. B．At an art gallery. C．At an airport. D．At a hotel.
A．Because it was cheap. B．Because it is in such good condition. C．Because it is a collector's item. D．Because he can resell it at a high pric