单项选择题

Questions 14 to 17 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions.
Now, listen to the passage.
When are airplanes not fuel efficient

A．On short trips.
B．On long trips.
C．When flying over cities.
D．When flying at high altitudes.

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单项选择题

单项选择题

Questions 14 to 17 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions. Now, listen to the passage. When are airplanes not fuel efficient 您的浏览器不支持 audio 元素。