对广义表L=((a，b)，(c，d)，(e，f))执行操作tail(tail(L))的结果是 ( ) 。
- A.(e，f)
- B.((e，f))
- C.(f)
- D.()
正确答案及解析
正确答案
解析
本题考查广义表的概念和特征。广义表是线性表的推广，有时也称其为列表，它的定义一般记作L=(a1，a2，…，an)。其中n是它的长度，而ai是其元素，它可以是单个元素，也可以是广义表。在广义表非空时，第一个元素是表头(head)，而其余元素组成的表是表尾(tail)。Tail(L)操作表示取表尾，即去除表头部分的操作。题目中给出的广义表L中有三个子广义表，其表头元素为(a，b)，那么tail(L)=((c， d)，(e，f)，对于这个广义表的表头元素为(c，d)，那么tail(tail(L))=((e，f))。
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