[单项选择]Just when you thought you knew a computer virus or worm when you saw one, several new infections that may fool you are gaining momentum on the Internet. Most e-mail viruses require the victim to double-click open an infected attachment before they can wreak their havoc. But Badtrans-B and Atiz, two worms that were spreading quickly over the weekend and Monday, can launch themselves automatically when the recipient views or even just clicks on the subject line of an infected e-mail message using Microsoft’s Outlook and Outlook Express programs. October’s Nimda virus used a similar technique, which helped it spread further and faster than it otherwise might have. Computer users were safe from viruses as long as they didn’t download programs from the Internet or open e-mail attachments. But these days, viruses are as capable of getting into computers as Santa Claus is at getting down chimneys. Antivirus software maker McAfee, a division of Santa Clara, Calif.’s Network Associates,
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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