单项选择题

What will possibly cause the plane to crash

A．The plane flies at high altitudes.
B．The plane is filled with air.
C．The metal structure of the plane is very strong.
D．A small part of the plane cracks.
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Before Andy Hildebrand retired, he worked for ______.
A．a record factory
B．the oil industry
C．a consultation company
D．the advertising industry
单项选择题
Why does the man resort to the woman
A．To inquire about switching majors.
B．To find a helping supervisor.
C．To make up the remaining credits.
D．To apply for a master’s degree.
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