解析:防火墙是一个系统开发。用来屏蔽威胁以保护部门、组织的网络。 ●Windows XP is Microsoft’s most advanced desktop(1)system. (1)A.operating B.programming C.security D.service 答案:(1)A 解析:Windows XP是微软公司开发的高级桌面操作系统。来源:www.100test.com ●Functional testing tests whether the output is the expected(2)with the valid input. (2)A.reason B.result C.outcome D.record 答案:(2)B 解析:功能测试是指测试在正确的输入下。输出结果是否在预料之中。 The basic concept of a data(3)is the difference between data and information- (3)A.warehouse B.storage C.base D.service 答案:(3)A 解析:数据服务的基本概念是数据和信息的不同之处。 Communication networks can be classified in terms of their physical arrangement or(4),Three common(4)are the star,bus,and ring. (4)A.structures B.topologies C.protocols D.frames 答案:(4)B 解析:通信网络可以按照物理范围或者拓扑结构来分类,常见的三种拓扑结构是星型、总线型、环型。 An operating system is(5). (5)A.the highest layer of software B.the lowest layer of software C.the highest layer of hardware D.the lowest layer of hardware 答案:(5)B 解析:操作系统是软件的最底层.