单项选择题

What does the author means 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
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The main idea of the second paragraph is______
A．how to avoid double-click on infected email attachments
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C．what new viruses can automatically launch themselves
D．what new viruses are capable of with an double-click on
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