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 the case that occurred in France in 1981, how many people witnessed it
A．One.
B．Two.
C．Three.
D．Five.
单项选择题
The news from China tells us that ______.
A．at least eighty-one people have been killed by flooding
B．a dangerous goods warehouse has been damaged by fire
C．many killed were unable to leave the building
D．the fire in a handicraft factory in southern China is striking
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