第12题: [单项选择]The operating system has several major components,including the (64) ,a memory management system,the file system manager,device drivers,and the system libraries. A. application kernel B. information kernel C. network kernel D. system kernel 参考答案:D 答案解析:[解析] 操作系统包含几大组成部分,其中有系统内核,内存管理系统,文件系统管理器,设备驱动程序和系统库。
第25题: [单项选择]A small number of firms have stopped trading. A. hotels B. shops C. restaurants D. companies 参考答案:D 答案解析:hotels:旅馆;shops:商店;restaurants:酒店;companies公司,和firm在此句的意思相同。