69． Organized in 1966 by the Fish and Wildlife Service，the Breeding Bird Survey uses annual roadside counts along established routes for monitoring of population changes of as many as，or of more than 250 bird species，including 180 songbirds
(A) for monitoring of population changes of as many as, or of
(B) to monitor population changes of as many, or
(C) to monitor changes in the populations of
(D) that monitors population changes of
(E) that monitors changes in populations of as many as，or
解释：
D That has no referent．
E That has no referent；of as many as, or is wordy．
The correct answer is C．
请问大家：为什么D和E的指代错误？是不是因为修饰了routes，所以逻辑上不对头呢？
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