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。

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英语

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