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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The researchers agree that how many friends one has is resulted from______.
单项选择题
Before Andy Hildebrand retired, he worked for ______.
A．a record factory
B．the oil industry
C．a consultation company
D．the advertising industry
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