单项选择题

A．15 years
B．50 years
C．six decades
D．four decades
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单项选择题
A．China and USA.B．Chile and France.C．France and Canada.D．Egypt and Greec
A．China and USA.
B．Chile and France.
C．France and Canada.
D．Egypt and Greec
单项选择题
A．longest defended borderB．longest undefended borderC．longest undefined borderD．longest coastal border
A．longest defended border
B．longest undefended border
C．longest undefined border
D．longest coastal border
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