The word "threatened" in the first sentence of the first paragraph could be best replaced by Piles of dung can’t be relied upon

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问题 The word "threatened" in the first sentence of the first paragraph could be best replaced by
Piles of dung can’t be relied upon when it comes to estimating elephant numbers because

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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