[A] applicable only to erratically fluctuating populations.
[B] instrumental, but only if its limitations are recognized.
[C] dangerously misleading in most circumstances.
[D] a complete and sufficient way to account for observed phenomena.
「解析」这是一道细节推导题。根据题干中的“dichotomy”可将本题的答案信息来源迅速确定在第二段的首句。如果考生能够正确理解该句中“but”一词前后的内容,就可以找出本题的正确选项B.考生在解题时一定要正确理解原文所传达的含义,即进行正确的细节推导。
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