单选题
The babies would "smile and bubble" at the lights because ______.
A、
the lights were directly related to some basic "drives"
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
【正确答案】
D
【答案解析】
本题为细节推理题。Papousek在实验中发现尽管灯亮的时候小孩开始笑了并说些什么，但他认为不是灯亮而是它能把灯弄亮才是高兴的原因。
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