1 圖卡兌換溝通系統(picture exchange communication system, PECS)的第 2 個階段為:
(A) 圖片區辨(picture discrimination)
(B)擴充自發性能力(expanding spontaneity)
(C)物品兌換(the physical exchange)
(D)回應「我要」句型結構(I want...)
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統計: A(6), B(38), C(10), D(0), E(0) #566080
統計: A(6), B(38), C(10), D(0), E(0) #566080