[B] the sight of the lights was interesting
[C] they need not turn back to watch the lights
[D] they succeeded in "switching on" the lights
15. According to Papousek, the pleasure babies get in achieving something is a reflection of _____.
[A] a basic human desire to understand and control the world
[B] the satisfaction of certain physiological needs
[C] their strong desire to solve complex problems
[D] a fundamenta1human urge to display their learned skills
责任编辑:yechenglu
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