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.
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Badtrans-B is
A．an anti-virus program.
B．an expert on viruses.
C．an anti-virus company.
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The main idea of the second paragraph is
A．how to avoid double-click on infected email attachments.
B．how emails both carry and spread viruses and worms.
C．what new viruses can automatically launch themselves.
D．what new viruses are capable of with an double-click on.
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