单项选择题

Questions 17--20 are based on the following passage. You now have 20 seconds to read Questions 17--20.
What would happen if a small part of the plane were to crack

A．The plane would not go forward.
B．The plane would explode.
C．The plane would fall down.
D．The plane would fly slowly.

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单项选择题

单项选择题

Questions 17--20 are based on the following passage. You now have 20 seconds to read Questions 17--20. What would happen if a small part of the plane were to crack 您的浏览器不支持 audio 元素。