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  3. With time flying, people become aged. Then many people even in their middle age often start to notice that their memory and ment

With time flying, people become aged. Then many people even in their middle age often start to notice that their memory and ment

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问题    With time flying, people become aged. Then many people even in their middle age 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 friend’ 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 damaging effect【C4】______our social and【C5】______well-being.
   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 basically 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 wave【C12】______mental effort.
   Now, a new web-based company has taken a step【C13】______and developed the first "brain training program" designed to actually help people improve and【C14】______their mental sharpness.
   The web-based program【C15】______you to systematically improve your memory and attention skills. The program keeps a(n)【C16】______of your progress and provides detailed feedback【C17】______your performance and improvement. Most importandy, it【C18】______changes and improves the games you play to【C19】______up the strengths you are developing—much like an effective exercise routine【C20】______requires you to increase resistance and vary your muscle use.
【C20】
选项 A、when
B、who
C、which
D、whose
答案C
解析 分析句子结构可知，routine后面为定语从句，先行词为routine，从句成分不完整，缺少主语，所以应用关系代词which来引导。故选C。
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