The word "threatened" in the first sentence of the first paragraph could be best replaced by According to Plumptre, the region

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问题 The word "threatened" in the first sentence of the first paragraph could be best replaced by
According to Plumptre, the region over which a dung-pile census is carried out should be

选项 A、small enough.
B、well protected.
C、carefully monitored.
D、large enough.

答案D

解析
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