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假设将循环队列定义为：以域变量rear和length分别指示循环队列中队尾元素的位置和内含元素的个数。给出此循环队列的队满条件，并写出相应的入队列和出队列的算法（在出队列的算法中要返回对头元素）。

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If a linguistic study describes and analyzes the language people acutually use, it is said to be ______.

A. presciptive
B. analytic
C. descriptive
D. linguistic

In modern linguistics, speeh is regarded as more basic than writing because ______.

A. in linguistic evolution, speech is prior to writing.
B. speech plays a greater role than writing in terms of the amount of information conveyed.
C. speech is always the way in which every native speaker acquires his mother tongue.
D. all of the above.

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According to F. de Saussure, ______refers to the abstract linguistic system shared by all the members of a speech community.

A. parole
B. competence
C. langue
D. performance

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Which of the following is not a design feature of human language?

Arbitrariness
B. Displacement
C. Duality
D. Meanigfulness

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