单项选择题

Questions 18 to 20 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. What steps have been taken by big airlines according to the passage

A．To reduce air fares.
B．To streamline airline structures.
C．To readjust their marketing strategy.
D．To pursue marketing alliances.

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单项选择题

单项选择题

Questions 18 to 20 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. What steps have been taken by big airlines according to the passage 您的浏览器不支持 audio 元素。