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Dr Golinkoff believes that parents don’t have to worry about using baby talks too much in communicating with their babies.

【参考答案】

Y

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In an experiment at Johns Hopkins University in USA, both of the experiment group and the ______ had 16 nine-month-old babies.

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According to Professor Jusczyk, a child is usually aware of the meaning of Mummy and Daddy as early as haft a year after birth.