单项选择题

A．longest defended border
B．longest undefended border
C．longest undefined border
D．longest coastal border
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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．should remain effectiveB．should be abolishedC．should be discussed againD．should be supplemented
A．should remain effective
B．should be abolished
C．should be discussed again
D．should be supplemented
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