Q:
      
      
         
            
In the following passage, some of the words have been left out. Read the passage carefully and select the correct answer for the given blank out of the four alternatives.
 
A brain and nervous system that are poorly developed or insufficiently nourished means low grade of ______________ in our mental processes, just as a poorly constructed or wrongly adjusted motor means loss of power in applying the electric current to its work. We will, __________, look upon the mind and the brain as counterparts of ___________ other, each performing activities which correspond to activities in the other, ________ inextricably bound together at least so far as this life is concerned, and each getting its _______________ by its union with the other. This view will lend interest to a brief study of the brain and nervous system.
 
as counterparts of ___________ other, each performing
 
         
       
      
      
      
          
      
      
      
      
      
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