单项选择题

This text is most probably taken from ______.

A．a newspaper magazine
B．a technician's report
C．a college textbook
D．a science thesis
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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
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
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