WASHINGTON—Considering the serious warnings lately about Internet viruses (病毒), users may be tempted to unplug their machines just to keep them safe. In reality, common sense and a few basic tips can keep Internet surfers secure.Antivirus software is a must, and it should be updated at least once a week to recog-nize newly released viruses.People with broadband Internet connections should also have a firewall. These pro-tect the computer from attacks by hackers (黑客).Then it is time to think about computer habits. Unlike old viruses, which spread on ly through shared diskettes, the Internet brings viruses straight to the emai-box. if email with attachment comes from an unknown sender, or unexpectedly from a known sender, it should not be opened.On receipt of an unexpected attachment from a friend, experts suggest a telephone call to make sure of the mail?s source before opening.Why should antivirus software be updated at least once a week? Because ______.
A.
the newly published antivirus software is more expensive
B.
the previous antivirus software cannot work longer than a week
C.
the inventors of viruses have suggested this idea
D.
computer viruses are always developing
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