单项选择题
37（）
A．which
B．that
C．it
D．this
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单项选择题
According to the Papousek, the pleasure babies get in achieving something is a reflection of ______.
A．a basic human desire to understand and control the world
B．the satisfaction of certain physiological needs
C．their strong desire to solve complex problems
D．a fundamental human urge to display their learned skills
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单项选择题
According to the author, babies learn to do things which ______.
A．are directly related to pleasure
B．will meet their physical needs
C．will bring them a feeling of success
D．will satisfy their curiosity
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