问题
单项选择题
Password is a secret series of (69) that enables a user to access a file, computer, or program. On multi-user systems, each user must enter his or her password before the computer will respond to (70) . The password helps ensure that (71) users do not access the computer. In addition, data files and programs may require a password.
A．power
B．authorized
C．accredit
D．unauthorized
答案
参考答案：D
解析：unauthorized意思为“未经过授权的”。结合题意，可知答案为D。