单项选择题

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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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
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