问题
填空题
In the early 1960s, the famous Swiss psychologist Piaget established his theory of ______ development.
答案
参考答案：cognitive
解析： 20世纪60年代初期，瑞士著名心理学家皮亚杰创立了认知发展理论(theory of cognitive development)，成为认知教学法的学习理论基础之一。