单项选择题

[b] in debate and [1] in delate can be said to form a(n) ______.

A. phonemic contrast
B. complementary distribution
C. assimilation rule
D. sequential rule
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单项选择题
The ______ feature is considered central to human language, which means two levels of structure or patterning .
A. duality
B. arbitrariness
C. displacement
D. ereativity
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