The writer thinks that the growth of specialist societies and periodicals has helped scholars to______.

A．are not critical engugh of those who have robbed the natural world
B．base their ideas on an unhealthy dualism
C．have the same basic mind-set as the industrial mainstream
D．have been unfairly criticized by restorationists

A．To establish the parameters of a following debate about man's role in nature.
B．To identify problem areas within a school of thought, which are then explored in greater detail.
C．To discuss secondary issues as an introduction to a more detailed examination of a primary issue.
D．To provide a historical background for a discussion of modern-day issues of public concern.