现代生物学研究的重要方法是______．该方法包括发现并提出问题、收集与问题相关的信息、______、设计并完成实验、记录和分析实验现象、得出结论等重要步骤．

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