项D，因为该选项所传达的信息与原文第一段第一、二句所传达的信息不一致。考生在解题时一定要学会迅速审题定位的能力。

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4The 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

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，通过仔细阅读第三段，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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5In the text, the author does all of the following EXCEPT

A.cite the views of other biologists

B.define a basic problem that the text addresses

C.present conceptual categories used by other biologists

D.describe the results of a particular study

参考答案： D

本题是一道写作手法题。这是一道比较难的题目，旨在考察考生的语言功底。本文作者在论述自己的观点时运用了各种写作手段。选项A、B、C中所涉及的内容分别在第一段、第三段和第二段中出现。考生一定要提高对原文各种写作手段的认识。

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