单项选择题

A．As
B．Due
C．Prior
D．Next
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单项选择题
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.
单项选择题
What would happen if a small part of the plane were cracked
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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