单项选择题

A．She’’d like to have the windows open.
B．She likes to have the air conditioner on.
C．The air is heavily polluted.
D．The windows are already open.
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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
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