单选题：For what purpose does the pilot shut off all the engines?

题目分类：公共英语四级
题目类型：单选题
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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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Please write a notice entitled "No Smoking" to put on the ca

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