As many people hit middle age, they often start to notice that their memory and mental clarity are not what they used to be. We

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问题     As many people hit middle age, they often start to notice that their memory and mental clarity are not what they used to be. We suddenly can’t remember【C1】________we put the keys just a moment ago, or an old acquaintance’s name, or the name of an old band we used to love. As the brain【C2】________, we refer to these occurrences as "senior moments".【C3】________seemingly innocent, this loss of mental focus can potentially have a(n)【C4】________impact on our professional, social, and personal【C5】________.
    Neuroscientists, experts who study the nervous system, are increasingly showing that there’s actually a lot that can be done. It【C6】________out that the brain needs exercise in much the same way our muscles do, and the right mental【C7】________can significantly improve our basic cognitive【C8】________Thinking is essentially a【C9】________of making connections in the brain. To a certain extent, our ability to【C10】________in making the connections that drive intelligence is inherited.【C11】________, because these connections are made through effort and practice, scientists believe that intelligence can expand and fluctuate【C12】________mental effort.
    Now, a new Web-based company has taken it a step【C13】________and developed the first "brain training program" designed to actually help people improve and regain their mental【C14】________.
    The Web-based program【C15】________you to systematically improve your memory and attention skills. The program keeps【C16】________of your progress and provides detailed feedback【C17】________your performance and improvement. Most importantly, it【C18】________modifies and enhances the games you play to【C19】________on the strengths you are developing—much like a(n)【C20】________exercise routine requires you to increase resistance and vary your muscle use.
【C18】

选项 A、irregularly
B、habitually
C、constantly
D、unusually

答案C

解析 考查词汇辨析。空格所在句意为“最重要的是,它能________调整并增强训练难度”。后面的to…是调整和增强训练难度的目的,而strengths是一个不断积累的过程,需要不断地调整与增强。故答案选C项constantly“不断地,经常地”。A项irregularly “不定期地,无规律地”和D项unusually“异常地,不寻常地”均不符合语境,故排除;B项habitually“习惯地,日常地”的主语应该为人,故排除。
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