段3：②Radesky cites the “still face experiment” devised by developmental psychologist Ed Tronick in the 1970s. ③In it, a mother is asked to interact with her child in a normal way before putting on a blank expression and not giving them any visual social feedback: The child becomes increasingly distressed as she tries to capture her mother’s attention. ④“Parents don’t have to be exquisitely present at all times, but there needs to be a balance and present need to be responsive and sensitive to a child’s verbal or nonverbal expressions of an emotional need,” says Radesky.
28. Radesky cites the “still face experiment” to show that .
[A] it is easy for children to get used to blank expressions
[B] verbal expressions are unnecessary for emotional exchange
[C] parents need to respond to children’s emotional needs
[D] children are insensitive to changes in their parents’ mood
答案：C
问：“still face experiment”的例子所服务的观点对应原文中的哪句话？
A : 段3句②
B : 段3句③
C : 段3句④
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