单项选择题

It is implied in the passage that _______.

A．parents can never hope to teach their children new sounds
B．children no longer imitate people after they being to speak
C．even after they have learnt to speak children still enjoy imitating
D．children who are good at imitating learn new words more quickly
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单项选择题
The problem Of deciding at what point a baby's imitations can be considered as speech _______.
A．is not especially important because tile change takes place gradually
B．is important because words have different meanings for different people
C．is one that can never be properly understood because the meaning of words changes with age
D．is one that should be completely ignored because children's use of words in often meaningless
单项选择题
The word project (Line 2, Para. 4) refers to _______ .
A．a comprehensive study of juvenile delinquency
B．a full exploration of research designs
C．an extensive research on crime
D．a further investigation into new research techniques
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