Password is a(n) (1) series of characters that enables a user (2) a file, computer or program. On multi - user systems, (3) user must enter his or her password (4) the computer will respond to commands. The password helps ensure that unauthorized users do not access the computer. In addition, data files and programs may require a password.

Ideally, the password should be something (5) could guess. In practice, most people choose a password that is easy to remember, such as their name or their initials. This is one reason it is relatively easy to break into most computer system.

1（）

A．obvious

B．secret

C．important

D．easy

2014年8月11日凌晨2时前后，广大天文爱好者欣赏到了本年度的“超级月亮”（指本年度“最大最圆”的月亮）。“超级月亮”上一次发生在2013年6月23日，下一次将出现在2015年9月28日。

“超级月亮”出现时，下列说法正确的是（）

 A．地球公转速度最快

B．出现的时间具有规律性

C．月亮、地球、太阳三者的位置不在一条直线上

D．会诱发强烈地震