21 (AB) It was Piaget's observations of his own children that served as the basis for many of his later theories.  (AC) Today, Piaget is best known for his research on children's cognitive development.

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統計： A(8), B(51), C(3), D(6), E(0) #1588229

詳解 (共 1 筆)

#5916008
選項 (B) "He continued...
(共 363 字，隱藏中）
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