题目：
A school of conservationist thought that continues to gain traction in academic
circles contends that despite the most noble of intentions, the U.S. National
Parks and Forests Services has, in allowing for the uncurbed growth of trees
within parks, contributed to the (i)____________ forest fires. While it is true
that park rangers can respond to fires quickly, often such fires are far
fiercer than in areas not so (ii)____________ trees and underbrush.
That is not to say that all fires are deleterious: indeed forest fires play
an appreciable role in the functioning of the ecosystem; they (iii)____________
the growth of trees so that any given area is less likely to become densely
wooded.
选项：
Blank(i) Blank(ii) Blank(ii)
(A)decrease in (D)choked with (G)check
(B)depletion of (E)devoid of (H)foster
(C)outbreak of (F)distant from (I)eradicate
Ans: (C)(D)(G)
想请教一下第二格blank以及其翻译，对于这段的逻辑还是没有很清楚。
While it is true that park rangers can respond to fires quickly,
often such fires are far fiercer than in areas not so ____________ trees
and underbrush.
恳请赐教，感激不尽。