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利用栈结构编写一个算法识别依次读入的一个以“@”为结束符的字符序列是否为形如“序列1&序列2”模式的字符序列。其中序列1 和序列2 中都不含字符“&”，且序列1是序列2的逆序列。例如，“a+b&b+a”是属该模式的字符序列，而“1+3&3-1”则不是。

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假设以带头结点的循环链表表示队列，并且只设一个指针指向队尾元素节点（注意不设头指针），编写相应的队列初始化、入队列和出队列的算法。

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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

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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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