下面是大学英语四级考试模拟题，育路教育网特别为您搜集整理，内容如下：
Directions: The following is a passage. After reading it, you are required to complete the statements that follow. You Should write your answers in no more than 3 words on the Answer Sheet correspondingly.
How to protect your computer from being attacked by a virus:
Be sure to have a good antivirus program and update it regularly. You will also want to make sure that your Internet browser and operating system have had all the necessary security patches (补丁) applied.
Then, you may think you have a virus, but how do you really tell? You scan your system for viruses with a software program. If you don't have antivirus software, you can purchase it online or you can use Panda Software's free ActiveScan that will scan you computer and report on any infections.
If the virus scan finds an infection, it will give you the name of the virus or viruses that you have contracted. If your computer is infected, you need to take immediate action. Depending on the severity of the virus, the health of your computer as well as the security of your computer data may be at risk. Look up the virus at one of the antivirus manufacturers's websites.
56. What should you do to protect your computer from a virus?
You must make sure that you have an ________________________.
57. How do you know that your computer is infected?
You know it by ____________________ your computer for virus with a software program.
58. What will you do if you don't have antivirus software in you computer?
You can ______________________ or you can use Panda Software' s free Active Scan.
59. What will you get after virus scanning if there is the virus?
You get the ____________________________ of the virus.
60. What will happen if the virus is very severe?
Your computer will be _____________________________.
参考译文
怎样保护电脑免受病毒侵袭：
确保装有性能良好的杀毒程序并定期更新。还要确保把浏览器和操作系统所必需的安全补丁都安装好。
还有，你可能认为电脑感染病毒了，但是如何正确识别呢?可以使用软件程序扫描系统中的病毒。如果没有杀毒软件，可通过网上购买，也可以使用熊猫软件的免费即时扫描程序，本程序可扫描电脑并报告所感染的病毒。
如果扫描程序发现电脑感染病毒，将会报告所中病毒的名称。如果电脑感染了病毒，应该马上采取措施。根据病毒的严重程度，电脑和电脑中的数据都可能有危险。可以登录一家杀毒软件制造商的网站查询病毒。
答案及精解
56．【答案精解】antivirus program。从原文Be sure to have a good antivirus program and update it regularly可以得到答案。注意题干中将a换成了an，所以在答案中就不能再用good了。
57．【答案精解】scanning。从原文you may think you have a virus，but how do you really tell? You scan your system for viruses with a software program可以得到答案。题干中scan作by的宾语，所以转化为scanning。
58．【答案精解】buy/purchase it online。从原文If you don't have antivirus software，you can purchase it online or you can use Panda Software's flee ActiveScan可以得到答案。
59．【答案精解】name of。从原文If the virus scan finds an infection，it will give you the name of the virus or viruses that you have contracted可以得到答案。
60．【答案精解】at risk。从原文Depending on the severity of the virus，the health of your computer as well as the security of your computer data may be at risk可以得到答案。