单项选择题

The passage is mainly concerned with ______.

A．application of analogy in studying juvenile delinquency
B．a research design concerning juvenile delinquency
C．significance of juvenile delinquency
D．an extensive survey of researches in juvenile delinquency
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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
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 the 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 is often meaningless
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