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  3. A hacker is ______. Hackers can do this because ______.

A hacker is ______. Hackers can do this because ______.

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问题 A hacker is ______.
Hackers can do this because ______.
选项 A、computers are hard to reach
B、everyone has their computers locked
C、computers are not very secure
D、companies ask them to do it
答案C
解析 见原文倒数第二、第三段。有些网站在方便用户的同时，也方便了黑客。所以是不安全的。
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