28. In Papouseks 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
29. 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
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