Trains are ____to planes in that railway terminals are often in the centre of the destination while airports are often located 20 or 30 kilometers away from the centre.
查看答案
The load of ____flights (of 90% or more) is usually higher than that of scheduled ones (which can be as low as 20%).
Cruising is a ____product rather than a mode of sea transportation.
The tours offered by specialist tour operators are often the ____tours.
According to the star classification, hotels can be classified into five categories and stars are used as a sign to ____them.