单项选择题

A．50 years old.
B．51 years old.
C．15 years old.
D．Never stop.
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单项选择题
A．Exploration.B．Increase oil production.C．Alternative sources of energy.D．Not of above all.
A．Exploration.
B．Increase oil production.
C．Alternative sources of energy.
D．Not of above all.
单项选择题
A．To other European countries.B．To the remote areas and suburbs.C．To the natural parks for birds.D．Back to their nests.
A．To other European countries.
B．To the remote areas and suburbs.
C．To the natural parks for birds.
D．Back to their nests.
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