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
According to Papousek the pleasure babies get in achieving something is a reflection of ______.
A．the satisfaction of certain physiological needs
B．their strong desire to solve complex problems
C．a basic human desire to understand and control the world
D．a fundamental human urge to display their learned skills
单项选择题
Laser-dopple radar ______.
A．measures the movement of a spaceship by means of light beam
B．makes use of microwaves
C．makes use of sound waves
D．both A and B
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