The onset of a new generation of computer attacks was marked by ______. What does the word "they" (Para. 4) refer toy ______.

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问题 The onset of a new generation of computer attacks was marked by ______.
What does the word "they" (Para. 4) refer toy ______.

选项 A、organized gangs.
B、PCs infected.
C、copies of the virus.
D、their files.

答案B

解析 这是一道词义题。依据第四段的内容可知,"they"指代的是"PCs infected"。
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