【单选题】 Hackers can do this because ______.
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
网考网参考答案:C
网考网解析:
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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