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.
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Which of the following cities is NOT located in the Northeast, U. S.
A．Huston.
B．Boston.
C．Baltimore.
D．Philadelphia.
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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