单项选择题

The onset of a new generation of computer attacks was marked by ______.

A．an organization of gangs
B．the infection of PCs
C．the sale of a software
D．a website's vanishing
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单项选择题
It can be inferred from the text that the purpose of the attack could be______.
A．to render the doorbell of the company useless
B．to prevent those nonstandard requests to visit
C．to make some demands of the company
D．to cancel some websites hated by terrorists
单项选择题
What does the word they (Para. 4) refer to
A．"organized gangs".
B．"PCs infected".
C．"copies of the virus".
D．"their files".
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