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  3. A hacker is ______. The programs which were used by the hackers were ______.

A hacker is ______. The programs which were used by the hackers were ______.

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问题 A hacker is ______.
The programs which were used by the hackers were ______.
选项 A、made by the hackers and put on computers
B、not found by the experts
C、prepackaged and found on many computers
D、hard to find
答案C
解析 见原文第二段。造成计算机系统瘫痪的软件已事先置于他人的计算机内等待时机。一旦开启该网页，该程序立即启动。
转载请注明原文地址:https://kaotiyun.com/show/kiSC777K
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