第9题: [单项选择]下列有关数据库的描述,正确的是( )。 A. 数据库是一个DBF文件 B. 数据库是一个关系 C. 数据库是一个结构化的数据集合 D. 数据库是一组文件 参考答案:C 答案解析:[解析] 数据库(Database,DB)是数据的集合,它具有统一的结构形式并存放于统一的存储介质内,是多种应用数据的集成,可被各个应用程序所共享。数据库中的数据具有“集成”和“共享”的特点。
第28题: [单项选择]A. His income is insufficient. B. He has no fixed asset. C. He has no stocks or bonds. D. He is self-employed. 参考答案:D 答案解析:[听力原文] Which of the following is not a reason that Philip has to get a guarantor
第29题: [单项选择]Consumers deprived of the information and advice they needed were quite simply ______ very cheat in the marketplace. A. at the mercy of B. in lieu of C. by courtesy of D. for the price of 参考答案:A 答案解析:[解析] 句中的(be)deprived of…意为“被剥夺了……”,在此句的意思相当于(be)short of…,即“缺乏 (信息)而且未被给以(必要的忠告的消费者们)”。据此推知,后面句子的大意是