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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
【申友解析】
正确答案：C
选项A the BBS uses annual roadside counts for monitoring of population changes of as many as, or of more than 250 bird species。 用for doing表示目的不如不定式to do有效.of as many as, or of more than结构复杂笨拙,改为 of as many as or more than更好
选项B as many结构不完整,应改为of as many as or more than
选项C 正确 the BBS uses annual roadside counts to monitor changes in the populations of more than 250 bird species。
选项D the BBS uses annual roadside counts (that monitors population changes of more than 250 bird species。)that的使用，是that之后的内容都变成了修饰成分，目的丢失
选项E 错误同D;monitors单复数错误
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