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.

參考答案：D

　　「解析」本題是一道歸納推導(dǎo)題。題干已明確指出該題的答案信息來源在第三段。第三段主要陳述“density-dependent factors”的作用，過仔細(xì)閱讀第三段，尤其是第三段的最后三句話，考生可以得知本文作者在第三段是在強(qiáng)調(diào)“density-dependent factors”的作用。可見D是本題的正確選項(xiàng)�？忌�在理解原文時(shí)一定要注意掌握歸納推導(dǎo)的能力。

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