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Read the following text. Choose the best word(s) for each numbered blank and mark A, B, C or D on the ANSWER SHEET. (10 points)

　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.

1．______

A.where
B.when
C.that
D.why

正确答案及解析

正确答案

解析

本题测试考生对宾语从句引导词的选择能力。Remember后接的宾语从句we put the keys缺少状语成分，故空格处应该填入连接副词（where，when，how，why）。因此排除C项that （that引导宾语从句时可省略，且从句结构完整。）根据上文“记忆力不如从前”，那么此处要表达的应该是“我们会突然想不起把钥匙放在哪里”。put表示“放置”时，常用“put sth. +地点状语”的搭配，A项where正确。从句本身已有时间状语（a moment ago），因此排除B项when；“忘记刚刚放钥匙的原因”不符合逻辑，排除D项why。