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
<上一题 目录 下一题>
热门 试题

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
相关试题