单项选择题

Questions 17--20 are based on the following passage. You now have 20 seconds to read Questions 17--20.
For what purpose does the pilot shut off all the engines

A．To find out exactly what happens.
B．To save fuel.
C．To fly more slowly.
D．To keep balance.

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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. For what purpose does the pilot shut off all the engines 您的浏览器不支持 audio 元素。