【单选题】In Papousek's experiment babies make learned movements of the head in order to ______.
A．have the lights turned on
B．be rewarded with milk
C．please their parents
D．be praised
【单选题】In Papousek's experiment babies make learned movements of the head in order to ______.
A．have the lights turned on
B．be rewarded with milk
C．please their parents
D．be praised
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