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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单项选择题
Which of the following is NOT a distinctive feature of human language
A．Arbitrariness.
B．Productivity.
C．Cultural transmission.
D．Finiteness.
单项选择题
The President during the American Civil War was______.
A．Andrew Jackson.
B．Abraham Lincoln.
C．Thomas Jefferson.
D．George Washington.
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