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Polish
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单项选择题
______ is a design feature of human language that enables speakers to talk about a wide range of things, free from barriers caused by separation in time and space.
A．Displacement
B．Arbitrariness
C．Duality
D．Productivity
单项选择题
In terms of size, America is the ______ country in the world.
A．largest
B．second largest
C．third largest
D．fourth largest
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