单项选择题

Badtrans-B is

A．an anti-virus program.
B．an expert on viruses.
C．an anti-virus company.
D．a new virus foun
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单项选择题
What does the author mean by saying gaining momentum on the Internet
A．Becoming more and more serious.
B．Being the most important moment.
C．Having the bigger and bigger impetus.
D．Gaining more velocity and weight.
单项选择题
What makes it more difficult to deal with the virus named SirCam
A．It will regularly pop up even when discovered.
B．It has a staying power in social engineering.
C．It takes a Microsoft Word document.
D．It is labeled various intriguing subject lines.
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