单项选择题


A．base
B．foundation
C．ground
D．basis
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单项选择题
A．relatedB．adaptedC．connectedD．fallen
A．related
B．adapted
C．connected
D．fallen
单项选择题
In Papousek's experiment babies make learned movements of the head in order to ______.
A．have the lights turned on
B．be rewarded with milk
C．please their parents
D．be praised
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