Melissa and LoveLetter made use of the trust that exists between friends or colleagues. Imagine receiving an (16) from a friend who asks you to open it. This is what happens with Melissa and several other similar email (17) . Upon running, such worms usually proceed to send themselves out to email addresses from the victim’s address book, previous emails, web pages (18) .
A. cracker B. user C. customer D. client
As administrators seek to block dangerous email attachments through the recognition of well-known (19) , virus writers use other extensions to circumvent such protection. Executable (.exe) files are renamed to .bat and .cmd plus a whole list of other extensions and will still run and successfully infect target users.
Frequently, hackers try to penetrate networks by sending an attachment that looks like a flash movie, which, while displaying some cute animation, simultaneously runs commands in the background to steal your passwords and give the (20) access to your network.
参考答案：A
解析： Melissa病毒和LoveLetter病毒充分利用了朋友和同事之间的信任。想象一下这种情况：你的朋友发一个附件给你，要你打开它。Melissa和其他类似的蠕虫病毒都采用的是这种手段。一旦你运行了这些病毒程序，蠕虫就会继续把自己发送到你的邮件地址。薄、以前接收的邮件，以及网页缓冲中。
当管理员试图用已知的扩展名来阻止危险的E-mail附件时，病毒的编写者就会使用其他的扩展名来保护。可执行文件(*.exe)被重命名成为．bat、.cmd等等其他的扩展名。这些病毒文件同样会被运行，然后成功地入侵目标用户。
通常，黑客会使用一个类似于flash的附件来入侵网络，这些flash通常会在播放一些可爱动画的同时，在后台窃取你的密码并把破解文件植入你的网络。