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 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
单项选择题
In the first paragraph, the author draws an analogy between ______.
A．doing research and drawing a picture
B．research finding and picture perspective
C．designing a research and making a quick drawing
D．a researcher and a painter
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