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What is the passage mainly about?
Whatisthepassagemainlyabout?
(A)Howbiochemicalchangesoccurinthehumanbrain.
(B)Whypeopleshouldkeepactivenotonlyphysicallybutalsomentally.
(C)Howintellectualactivitiesinfluencebrain-cellhealth.
(D)Whypeopleshouldreceivespecialmentaltrainingastheyage.


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