单项选择题

The major contribution of this study is to _______.

A．develop a new research technique easily transferred from one area to another
B．make a comprehensive analysis of juvenile delinquency
C．demonstrate the successful application of new research techniques in a new area
D．modify creatively the previous research finding of juvenile delinquency
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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
Children who start speaking late _______.
A．may have problems with their hearing
B．usually pay close attention to what they hear
C．often take a long time in learning, to listen properly
D．probably do not hear enough language spoken around them
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