单项选择题
Questions 11 to 15 are based on the following news. At the end of the news item, you will be given 10 seconds to answer each question. Now listen to the news.
Which of the following statements is INCORRECT（）
A．The possibility of discounts depends on a travel agent’s volume of business.
B．Longer flights to the same destination maybe cheaper.
C．It is advisable to plan every detail of a trip in advance.
D．Arranging for stopovers can avoid overnight travel.