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.
【B4】

选项 A、uneven
B、limited
C、damaging
D、obscure

答案C

解析 本句中提到了loss of mental focus(精神集中力的丧失),其对我们有什么样的影响(impact),结合前文可知,这种影响应该是负面的、不利的。虽然四个选项中的单词都不含褒义,但真正能够表示对我们产生不利影响的只有[C]damaging“破坏性的”,故答案为[C]。
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