单项选择题

According to the author, babies learn to do things which ______.

A．will satisfy their curiosity
B．will meet their physical needs
C．are directly related to pleasure
D．will bring them a feeling of success
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单项选择题
In Papousek's experiment babies make learned movements of the head in order to ______.
A．be praised
B．please their parents
C．be rewarded with milk
D．have the lights turned on
单项选择题
The babies Would smile and bubble at the lights because ______.
A．they succeeded in "switching on" the light
B．the sight of the lights was interesting
C．they need not turn back to watch the lights
D．the lights were directly related to some basic "drives”
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