单项选择题

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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单项选择题

Which of the following would the virus SirCam usually arrive entitled

A．"Business plan."
B．"Fw: Funky pictures -- check it."
C．Anything as in the title of the Word file.
D．"I send you this file in order to have your advice."

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 the form of a Microsoft Word document.
D．It is labeled various intriguing subject lines.