单选题：What is the way that the computer viruses infect the compute

题目分类：公共英语三级
题目类型：单选题
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题目内容：

What is the way that the computer viruses infect the computer systems? A．They invade the computer and make it a place for manufacturing.
B．They spread throughout the whole system by quickly copying themselves.
C．They infect the hard disc and the whole system.
D．They spread viruses inside the computer system.

参考答案：

答案解析：

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