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单项选择题

A．longest defended borderB．longest undefended borderC．l……

The US border with Canada is the ______ in the world.



A．longest defended border
B．longest undefended border
C．longest undefined border
D．longest coastal border
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热门试题

填空题accumulate

单项选择题In which countries are there programs of persuing UFO A. China and US

A．
B．Chile and France.
C．France and Canada.
D．Egypt and Greece.

单项选择题If Quebec was separated from Canada, the two pacts with US ______.

A．should remain effective
B．should be abolished
C．should be discussed again
D．should be supplemented

单项选择题Peter Sturrock thinks that the field of UFO study is in a state of ______.

A．popularization
B．pause
C．development
D．ignorance and confusion

填空题modification