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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