单项选择题

According to the author, three design types of previous researches are ______.

A．interrelated to one another
B．supplementary to one another
C．to be modified considerably
D．to be integrated into one design
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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 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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