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
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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
单项选择题
______ is regarded as the most successful religious allegory in the English language.
A．The Pilgrim's Progress
B．Grace Abounding to the Chief of Sinners
C．The Life and Death of Mr. Badman
D．The Holy War
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