A．John Searle. B．John Austin. C．Noam Chomsky. D．M. A. K. Halliday.
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
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.
