第26题: [单项选择]What is the main idea of this passage A. How to strengthen security through a password. B. How to choose a password that is easy to remember. C. How to prevent your password from being cracked. D. How to choose a safe and convenient password. 参考答案:D 答案解析:第二篇文章全文是关于计算机“密码”。文章第一段就出现了passwords和PINs。第二段谈到了选择既安全又简单易记的密码这一问题。后面的内容对这个问题作出了回答,因此答案为D。