239. 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 答案是B一刚,AS MANY 没有AS的,难道这是有效性错误? | 
