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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 小題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小題2: your computer is a problem now. But in fact, nothing can ensure (保證) the security of your computer one hundred percent. There are, somehow some things you can do to 小題3: your computer’s security system and decrease (降低) the possibility of an infection.
You can 小題4: your system up to date with the current anti-virus software (反病毒軟件), and use the following methods

小題1:B
小題2:C
小題3:A
小題4:D

試題分析：這篇短文主要介紹了當你正在電腦上忙著你的學習時，你的電腦的速度有時會突然慢下來,這可能是感染了病毒。所以怎樣使病毒遠離你的電腦成為了一個問題。
小題1:你發現了沒有，當你正在電腦上忙著你的學習時，你的電腦的速度有時會突然慢下來，根據句意及后文，故填B
小題2:現在怎樣使病毒遠離你的電腦是一個問題，keep…away，使……遠離，根據句意，故填C
小題3:你能做一些事情以改善你的電腦的安全系統，降低感染的可能性，根據句意，故填A
小題4:你可以更新你的系統以和當前的反病毒軟件同步，根據句意，故填D

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