题目内容：
In Papousek's experiment babies make learned movements of the head in order to___．
A．have the lights turned on B．please their parents
C．be rewarded with milk
D．be praised
参考答案：
答案解析：
单选题：In Papousek's experiment babies make learned movements of th
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B．please their parents
C．be rewarded with milk
D．be praised