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Neurogenesis occurs______.
A.in our whole life
B.when excess connections are pruned
C.in three short periods
D.when the brain is exercised

A.A.in
B.when
C.in
D.when

【参考答案】

A
解析：该句中提到“直到最近人们才发现，在我们的一生中(throughout our lives)，新的脑细胞......

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