2. 外语
  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 that we put the keys just a moment ago, or an old【M1】________
acquaintance’s name, or the name of an old band we used to love. As the
brain fades, we refer to these coincidences as "senior moments. " While【M2】________
seemingly innocent, this loss of mental focus can potentially have
damaging impact on our professional, social, and personal well-being. 【M3】________
Neuroscientists are increasingly showing that there’s actually a lot that
can be done. This turns out that the brain needs exercise in much the same【M4】________
way our muscles do, and the right mental workouts can significantly
improve our basic cognitive functions. Thinking is essentially a process
of making neural connections in the brain. To a certain extent, our ability to
excel in making the neural connections that drives intelligence is inherited. 【M5】________
However, because these connections are made through effort and practice,
scientists believe that intelligence can expand and fluctuate as to mental【M6】________
effort.
Now, a new San Francisco Web-based company has taken a step farther【M7】________
and developed the first "brain training program" design to actually help【M8】________
people improve and regain their mental sharpness.
The web-based program allows you to systematically improve your
memory and attention skills. The program keeps track of your progress and
provides detailed feedback for your performance and improvement.  Most【M9】________
importantly, it constantly modifies and enhances the games you play to
build on the strengths you are developing—much like an effective exercise
routine requires you to increase resistant and vary your muscle use.      【M10】________
【M3】
选项
答案∧damaging→a
解析 冠词缺失。impact作名词时为可数名词，表示“作用，影响”，固定搭配为“have a(an)…impact on sth．”，故应在damaging前加不定冠词a。
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