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 was the outcome of the policy of the American government toward the airline industry

A．It proved successful.
B．It was a futile effort.
C．It led to a mixed result.
D．It was not encouraging.

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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 was the outcome of the policy of the American government toward the airline industry 您的浏览器不支持 audio 元素。