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(dāng)你正在電腦上忙著你的學(xué)習(xí)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(fā)現(xiàn)了沒有，當(dāng)你正在電腦上忙著你的學(xué)習(xí)時，你的電腦的速度有時會突然慢下來，根據(jù)句意及后文，故填B
小題2:現(xiàn)在怎樣使病毒遠離你的電腦是一個問題，keep…away，使……遠離，根據(jù)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(tǒng)，降低感染的可能性，根據(jù)句意，故填A(yù)
小題4:你可以更新你的系統(tǒng)以和當(dāng)前的反病毒軟件同步，根據(jù)句意，故填D
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