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
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”
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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