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第二节完形填空（共20小题，每小题1．5分，满分30分）
阅读下面短文，从短文后面各题所给的四个选项（A、B、C和D）中选出可以填入空白处的最
佳选项，并在答题卡上将该项涂黑。
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 36 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 _37_, we refer to these occurrences as "senior moments．" 38 seemingly innocent, this loss of mental focus can potentially have a（n） 39 effect on our social and 40 well—being．
Neuroscientists,-experts who study the nervous system, are increasingly showing that there' s actually a lot that can be done．It 41 out that the brain needs exercise in much the same way our muscles do, and the right mental ____42_ can significantly improve our basic cognitive（ 认知 ） 43 ．Thinking is basically a 44 of making connections in the brain．To a certain ;extent, our ability to 45 in making the connections that drive intelligence is inherited（继承） 46 , be-cause these connections are made through effort and practice, scientists believe that intelligence can expand and wave 47 mental effort．
Now, a new Web-based company has taken a step 48 and developed the first "brain training program" designed to actually help people improve and 49 their mental sharpness．
The Web-based program 50 you to systematically improve your memory and attention skills．The program keeps a（ n） 51 of your progress and provides detailed feedback（反馈） 52 your performance and improvement．Most importantly, it 53 changes and improves the games you play to 54 up the strengths you are developing—much like a（ n ） 55 exercise routine which requires you to increase resistance and vary your muscle use．
36．A．where B．when C．that D．why
37．A．improves B．fades C．recovers D．falls
38．A．If B．Unless C．Once D．While
39．A．irregular B．limited C．damaging D．positive
40．A．personal B．psychological C．mental D．physical
41．A．turns B．finds C．points D．figures
42．A．connection B．responses C．workouts D．associations
43．A．style B．functions C．circumstances D．atmosphere
44．A．steps B．condition C．consequences D．process
45．A．insist B．believe C．succeed D．fail
46．A．Therefore B．Moreover C．Otherwise D．However
47．A．according to B．regardless of C．apart from D．instead of
48．A．back B．further C．aside D．around
49．A．regain B．reflect C．review D．respond
50．A．suggests B．makes C．hurries D．allows
51．A．hold B．record C．order D．pace
52．A．to B．with C．for D．about
53．A．irregularly B．habitually C．constantly D．unusually
54．A．carry B．put C．build D．take
55．A．risky B．effective C．meaningless D．familiar
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