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12.A.improve    B.suddenly    C.out of    D.keep    E.take

Do you find that when you are busy with your study on the Internet,the speed of your computer slows down (46)B 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 (47)C 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 (48)A your computer's security system and decrease (降低) the possibility of an infection.
You can (49)D your system up to date with the current anti-virus software (反病毒软件),and use the following methods.

分析 你是否发现当你在网上忙于学习时,有时电脑的速度突然缓慢了?这很可能是因为电脑感染了病毒,让你使用电脑更加困难.现在如何让电脑远离病毒是一个问题.但事实上,没有什么可以保证你的电脑百分之百的安全.你可以做一些事情来提高电脑的安全系统,降低感染病毒的可能性.你可以安装当下的反病毒软件来升级更新系统,并使用下面的这些方法.

解答 46.B.句子结构完整,划线处缺一个副词修饰slows down,根据句意"有时电脑的速度突然缓慢了"应选择B,表示突然地.
47.C.句意是"如何让电脑远离病毒是一个问题.",keep out of表示远离,故选择C.
48.A.划线处前是to,其后应填写一个动词原形,根据句意"你可以做一些事情来提高电脑的安全系统."应选择A,表示提高.
49.D.划线处前是情态动词can,后应跟动词原形,句意是"你可以安装当下的反病毒软件来升级更新系统",up to date表示最新的,keep+名词+形容词表示使…处于某种状态,故选择D.

点评 本题考查选词填空,所给词都是适当形式,且有一个多余选项,难度一般.本文是一篇说明文,主要讲述了电脑难免会遭到病毒感染,应该采取一些措施降低感染的可能性.考生做题时首先应熟悉所给单词含义,再根据句子成分、短语固定搭配及题干即可作出选择.

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