单项选择题
Questions 11 to 13 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. Now, listen to the passage.
It can be learned from the passage that（）
A．air journeys are quite often far from comfortable.
B．air travellers usually enjoy luxury during flight.
C．air travellers usually enjoy upgraded conditions.
D．airlines always provide good in-flight entertainment.