简答题Airline companies have three main businesses, which are___________? A、Cargo service B、Passenger service C、Tourist service D、All of the above简答题Cruiseis not only a form of transportation but also a tourism attraction or activity.简答题We can identify four basic elements in any transportation system, namely the way, the terminal,___________, and motive power: A、the city B、the vehicle C、the traffic D、the passenger简答题Business travellers are usually time-sensitiveand do not really worry about the transportation costs.