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.
【C17】

选项 A、to
B、with
C、for
D、on

答案D

解析 考查固定搭配。feedback on意为“对…的反馈”,故选D项。
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