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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.

Which factor can be the most potential danger for the airplane
A．The bad weather.
B．Mistakes made by the air traffic controllers.
C．The loss of control of the airplane.
D．The breach of duty of the pilot.
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