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    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 (1)_____ 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 (2)_____, we refer to these occurrences as “senior moments.” (3)_____ seemingly innocent, this loss of mental focus can potentially have a(n) (4)_____ impact on our professional, social, and personal (5)_____.

     Neuroscientists, experts who study the nervous system, are increasingly showing that there’s actually a lot that can be done. It (6)_____ out that the brain needs exercise in much the same way our muscles do, and the right mental (7)_____ can significantly improve our basic cognitive (8)_____. Thinking is essentially a (9)_____ of making connections in the brain. To a certain extent, our ability to (10)_____ in making the connections that drive intelligence is inherited. (11)_____, because these connections are made through effort and practice, scientists believe that intelligence can expand and fluctuate (12)_____ mental effort.

     Now, a new Web-based company has taken it a step (13)_____ and developed the first “brain training program” designed to actually help people improve and regain their mental (14)_____.

     The Web-based program (15)_____ you to systematically improve your memory and attention skills. The program keeps (16)_____ of your progress and provides detailed feedback (17)_____ your performance and improvement. Most importantly, it (18)_____ modifies and enhances the games you play to (19)_____ on the strengths you are developing—much like a(n) (20)_____ exercise routine requires you to increase resistance and vary your muscle use.

(20)

A
risky
B
effective
C
idle
D
familiar
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答案:

B

解析:

答案精析:形容词辨析题。空格处填入的形容词用于修饰空格后的exercise routine,用于说明锻炼的特点。根据前文意思可知,大脑训练课程会根据你的实际情况不断地做调整,而且对人类大脑的帮助作用都是积极的,故本空也应填入一个表示积极意义的形容词来修饰exercise routine。因此本空应填入effective。

错项排除:A项risky“危险的”和C项idle“懒惰的”均表示负面意思,故排除。D项familiar“熟悉的”与大脑训练课程的效果无关,与原文逻辑不符,故排除。

长难句分析:Most 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 resistance and vary your muscle use.

句子主干是…it modifies and enhances the games…。the games后省略了that/which,由you play修饰,后面的to build on the strengths you are developing为目的状语,其中定语从句you are developing修饰the strengths,省略了that/which。破折号后面的句子是对前面的主句作进一步解释,引出类比,修饰整个主句。

句意为:最重要的是,它会不断地调整和增强你的训练难度,从而巩固训练成果——这与有效的日常训练很相似,需要你增加耐力,并让各部分肌肉得到锻炼。

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