第7题: [单项选择]按照“先进后出”原则组织数据的数据结构是( )。 A. 队列 B. 栈 C. 双向链表 D. 二叉树 参考答案:B 答案解析:[解析] 栈是一种特殊的线性表,其插入和删除运算都只在线性表的一端进行,另一端是封闭的。进行插入、删除的一端称为栈顶,封闭的一端称为栈底。栈顶元素是最后被插入的元素,不是最后被删除的,是按先进后出的原
第19题: [单项选择]Questions 13 to 15 are based on the conversation you have just heard. A. Because carts scared the pigs away. B. Because carts injured a large number of people. C. Because carts often moved too slowly. D. Because carts broke down too easily. 参考答案:C 答案解析:[解析] Q: Why were carts considered the problem in colonial towns