77. What does the word counterparts in the second paragraph refer to?
(A) Those who had better cognitive functions.
(B) Those who took part in the experiment.
(C) Those who had less gray matter in the brain.
(D) Those who did not play Super Mario 64.
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統計: A(457), B(382), C(486), D(1519), E(0) #1450692
統計: A(457), B(382), C(486), D(1519), E(0) #1450692