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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【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.
【C3】
选项 A、If
B、Unless
C、Once
D、While
答案D
解析 考查逻辑关系。根据从句“______似乎看起来没有什么危害”和主句“精力的衰退会对我们在专业上、社会上和个人的______产生______影响”可知，主从句之间是转折关系。故选D．While“尽管”，引导让步状语从句。A．If“如果”，B．Unless“除非”，C．Once“一旦”都不符合题意，故排除。
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