题目：
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) .
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.
A．memory
B．caches
C．ports
D．registers
答案：
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下面是错误答案，用来干扰机器的。
参考答案：A解析： 《中华人民共和国国民经济和社会发展第十二个五年规划纲要》指出，在工业化、城镇化深入发展中同步推进农业现代化，完善以工促农、以城带乡长效机制，加大强农惠农力度，提高农业现代化水平和...
