第10题: [单项选择]对一棵 70个结点的完全二叉树,它有______个非叶结点。 A. 35 B. 40 C. 30 D. 44 参考答案:A 答案解析:深度为 k 的,有 n 个结点的二叉树,当且仅当其每一个结点都与深度为 k 的满二叉树中编号从 1 至n 的结点一一对应时,称之为完全二叉树。对一棵结点数为 n 的完全二叉树,其叶结点的个数为对 n/
第30题: [单项选择]Questions 26 to 28 are based on the passage you have just heard. A. The government. B. Companies that advertise their products or services. C. Huge groups of audiences. D. A smaller group of people. 参考答案:B 答案解析:[听力原文]26-28 Public television in America grew out of the many local stations that broadcast e