题目内容：
Radesky's cites the "still face experiment" to show that_______.
A．it is easy for children to get used to blank expressions A．it is easy for children to get used to blank expressions
B．verbal expressions are unnecessary for emotional exchange
B．verbal expressions are unnecessary for emotional exchange
C．children are insensitive to changes in their parents' mood
C．children are insensitive to changes in their parents' mood
D．parents need to respond to children's emotional needs
D．parents need to respond to children's emotional needs
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