单项选择题

The reason for the necessity of continuing education is that______

A．you have to stay current in your discipline
B．new ideas and technologies are to be discussed
C．you have just completed your studies
D．you are just beginning to work

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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.

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