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Do you find that when you are busy with your study on the Internet, the speed of your computer slows down   小题1:  sometimes? It is probably because your computer gets infected by virus (病毒), which can make it more difficult for you to use the computer. How to keep viruses小题2: your computer is a problem now. But in fact, nothing can ensure (保证) the security of your computer one hundred percent. There are, somehow some things you can do to  小题3: your computer’s security system and decrease (降低) the possibility of an infection.
You can   小题4: your system up to date with the current anti-virus software (反病毒软件), and use the following methods

小题1:B
小题2:C
小题3:A
小题4:D

试题分析:这篇短文主要介绍了当你正在电脑上忙着你的学习时,你的电脑的速度有时会突然慢下来,这可能是感染了病毒。所以怎样使病毒远离你的电脑成为了一个问题。
小题1:你发现了没有,当你正在电脑上忙着你的学习时,你的电脑的速度有时会突然慢下来,根据句意及后文,故填B
小题2:现在怎样使病毒远离你的电脑是一个问题,keep…away,使……远离,根据句意,故填C
小题3:你能做一些事情以改善你的电脑的安全系统,降低感染的可能性,根据句意,故填A
小题4:你可以更新你的系统以和当前的反病毒软件同步,根据句意,故填D
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