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  3. 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

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【B1】______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【B2】______, we refer to these occurrences as "senior moments." 【B3】______seemingly innocent, this loss of mental focus can potentially have a(n)【B4】______impact on our professional, social, and personal【B5】______.
    Neuroscientists, experts who study the nervous system, are increasingly showing that there’ s actually a lot that can be done. It【B6】______out that the brain needs exercise in much the same way our muscles do, and the right mental【B7】______can significantly improve our basic cognitive【B8】______. Thinking is essentially a【B9】______of making connections in the brain. To a certain extent, our ability to【B10】______in making the connections that drive intelligence is inherited.【B11】______, because these connections are made through effort and practice, scientists believe that intelligence can expand and fluctuate【B12】______mental effort.
    Now, a new Web-based company has taken it a step【B13】______and developed the first "brain training program" designed to actually help people improve and regain their mental【B14】______.
    The Web-based program【B15】______you to systematically improve your memory and attention skills. The program keeps【B16】______of your progress and provides detailed feedback【B17】______your performance and improvement. Most importantly, it【B18】______modifies and enhances the games you play to【B19】______on the strengths you are developing—much like a (n)【B20】______exercise routine requires you to increase resistance and vary your muscle use.
【B14】
选项 A、sharpness
B、stability
C、framework
D、flexibility
答案A
解析 考查名词辨析。本句意为“…旨在帮助人们改善并恢复头脑的______”，本文强调的是大脑对事情的记忆等功能性的退变，所以应该是大脑的敏锐性，故A．sharpness“敏锐”为正确答案。B．stability“稳定性”，C．framework“框架”不符合逻辑，直接排除。D．flexibility“灵活性”有一定的干扰，可是本文没有谈到大脑是否灵活。
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