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  3. Piles of dung can't be relied upon when

Piles of dung can't be relied upon when

考试题库2022-08-02  63
问题 Piles of dung can't be relied upon when it comes to estimating elephant numbers becauseA they are different in size.B they scatter all over the region.C they are different in decay rate.D they are different in quality.
选项 A they are different in size.
B they scatter all over the region.
C they are different in decay rate.
D they are different in quality.
答案 C
解析
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