Software（ ）focuses on three attributes of the program: software architecture， data structure， and procedural detail.
A. analysis
B. design
C. installation
D. upgrade
The（ ）scheme in a database system is responsible for the detection of failures and for the restoration of the database to a state that existed before the occurrence of the failure.
A. query
B. test
C. check
D. recovery
Data items are added or deleted from the list only at the top of the（ ）.
A. queue
B. stack
C. tree
D. linear list
（ ）means that a program written for one computer system can be compiled and run on another system with little or no modification.
A. Portability
B. Reliability
C. Availability
D. Reusability
Outlook Express作为邮件代理软件有诸多优点，以下叙述中，错误的是（ ）。
A. 可以脱机处理邮件
B. 可以管理多个邮件账号
C. 可以使用通讯簿存储和检索电子邮件地址
D. 不能发送和接收安全邮件
以下关于网络攻击的叙述中，错误的是（ ）。
A. 钓鱼网站通过窃取用户的账号、密码来进行网络攻击
B. 向多个邮箱群发同一封电子邮件是一种网络攻击行为
C. 采用DoS攻击使计算机或网络无法提供正常的服务
D. 利用Sniffer可以发起网络监听攻击