单项选择题

A．strong winds and lack of water
B．rapid economic growth
C．locked doors and windows
D．overcrowded people
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单项选择题
A．15 yearsB．50 yearsC．six decadesD．four decades
A．15 years
B．50 years
C．six decades
D．four decades
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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