Viruses can worm their way into your computer from a variety of sources that contain viruses. Once viruses get into your online business computer, it can wreak havoc in a variety of ways that range from sending spam emails out to your database of customers to completely shutting down your computer. The best way to prevent viruses, worms and other problems from infecting your computer and your online business is to install anti-virus software. Also be sure to keep the antivirus software up-to-date.
Hackers and other unauthorized individuals accessing information on your customers and personal and business financial information can create a myriad of problems including identity theft. In order to prohibit unauthorized sources from accessing all of this pertinent information, you should install a firewall, which blocks unauthorized access to your computer. It is just as important to maintain your firewall by updating it regularly to further protect your computer.
A loss of your business data can occur from a virus or another malfunction with your computer. It's imperative that you institute a backup protocol to ensure that you have a recent copy of the data and programs on your computer. Not only does backup data protect you from a loss from virus infection, but it also ensures you can recover your business information on business website if there is a fire or theft.
13. Once you install an anti-virus software or firewall, it is also necessary to regularly _______.
A、update them
B、block them
C、control them
D、shut them down
【正确答案】：A
【题目解析】：题目问的是一旦安装了杀毒软件或防火墙，也有必要定期......，根据文章第二段的最后一句 It is just as important to maintain your firewall by updating it regularly to further protect your computer.通过定期更新来维护您的防火墙，以进一步保护您的计算机，这一点同样重要。选项A 更新；选项B 限制；选项C 控制；选项D 关闭。所以只有选项A与文章内容相符，故选A。
