第26题: [单项选择]下述哪一个数据库系统属于第一代数据库系统 A. Sybase B. Ingress C. IMS D. Object Store 参考答案:C 答案解析:[解析] 第一代数据库系统指层次模型数据库系统。层次模型数据库的代表是IBM公司于1969年研制出的信息管理系统(IMS),IMS是最早和使用最广的几个数据库之一。
第27题: [单项选择]Questions 7 and 8 are based on the following news.What happened shortly after the explosion A. Shops on the street closed down. B. People were fleeing the city. C. Shooting broke out. D. Assembly meeting was immediately held. 参考答案:C 答案解析:[听力原文] 7-8 Two powerful car bombs have exploded in a crowded part of San Salvador. Two boys wer