单项选择题

A．Teacher and student.
B．Father and daughter.
C．Husband and wife.
D．Neighbours.
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单项选择题
A．The woman.B．Jack.C．John.D．The man.
A．The woman.
B．Jack.
C．John.
D．The man.
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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