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Common and easily accessible resources (prey for predators or hosts for parasites) should be, all other things being equal, used frequently, yet in some environments apparently accessible and suitable resources remain _____.
- A.vulnerable
- B.unobtainable
- C.sustainable
- D.depleted
- E.unexploited
E显示答案
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取反-让步转折
取反-让步转折
以上解析由 考满分老师提供。
