The discussion concerning population in the third paragraph serves primarily to

The discussion concerning population in the third paragraph serves primarily to

　　[A] demonstrate the difficulties ecologists face in studying density-dependent factors limiting population growth.

　　[B] advocate more rigorous study of density-dependent factors in population growth.

　　[C] prove that the death rates of any population are never entirely density-independent.

　　[D] underline the importance of even small density-dependent factors in regulating long-term population densities.

参考答案：D

　　「解析」本题是一道归纳推导题。题干已明确指出该题的答案信息来源在第三段。第三段主要陈述“density-dependent factors”的作用，过仔细阅读第三段，尤其是第三段的最后三句话，考生可以得知本文作者在第三段是在强调“density-dependent factors”的作用。可见D是本题的正确选项。考生在理解原文时一定要注意掌握归纳推导的能力。

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