单项选择题

U. S. presidents normally serve a(n) （） term.

A．two-year
B．four-year
C．six-year
D．eight-year

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Which of the following is NOT a distinctive feature of human language ？（）

A．Arbitrariness.
B．Productivity.
C．Cultural transmission.
D．Finiteness.
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The novel Emma is written by （）.

A．Mary Shelley.
B．Charlotte Bronte.
C．Elizabeth C. Gaskell.
D．Jane Austen.
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