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题库 / Prep2007E1-SC-2
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.
for monitoring of population changes of as many as, or of
to monitor population changes of as many, or
to monitor changes in the populations of
that monitors population changes of
that monitors changes in populations of as many as, or
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it's possible to have "as many" by itself—but only if there's an obvious reference to a numerical figure given elsewhere in the sentence.
e.g.,
last year, i read 100 books; i have not read as many (= 100) this year.
there's nothing like this in the sentence at hand.
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