The basic principles applied to natural-gas vehicles are quite different from those applied to gasoline-powered vehicles.

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

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