21. Ellie delights in playing "'peek-a-boo" and actively lifts the newspaper to find her
uncle who is hiding his face behind a newspaper. Ellie is showing what concept?
(A) accommodation
(B) assimilation
(C)ego centrism
(D)object permanence
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統計: A(0), B(1), C(0), D(2), E(0) #2993469
統計: A(0), B(1), C(0), D(2), E(0) #2993469