Melissa and Love Letter made use of the trust that exists between friends or colleagues. Imagine receiving an __(71)___from a friend who asks you to open it. This is what happens with Melissa and several other similar email __(72)___.Upon running ,such worms usually proceed to send themselves out to email addresses from the victim's address book, previous emails, web pages__(73)___.
As administrators seek to block dangerous email attachments through the recognition of well-known ___(74)____,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 __(75)__access to your network.
（75）处填（）。
A．cracker
B．user
C．customer
D．client
参考答案：A
解析：
(71)～(75)[分析]
Melissa和LoveLetter利用了朋友和同事之间的信任。设想你收到了一个附件，朋友要求你打开它。这就是Melissa和其他类似的电子邮件蠕虫危害的方式。一旦被运行，这种蠕虫常常就从受害人的地址簿、以前的电子邮件、Web页面缓存区等地方发现邮件地址，并且把它们发送出去。
在管理人员通过识别众所周知的扩展名企图阻挡危险的email附件时，病毒的作者们则使用了其他的扩展名来破坏这种保护。可执行文件(.exe)被重新命名为.bat和.cmd，再加上其他的扩展名，而且仍然可以运行，成功地危害目标用户。
黑客们经常试图穿透网络发送一种像是flash影像的附件，当这种flash演示引人入胜的动画时，同时就在后台运行命令来偷窃你的口令，给了那些解密高手访问你的网络的机会。