4. The discussion concerning population in the third paragraph servesprimarily to
[A] demonstrate the difficulties ecologists face in studyingdensity-dependent factors limiting population growth.
[B] advocate more rigorous study of density-dependent factors inpopulation growth.
[C] prove that the death rates of any population are never entirelydensity-independent.
[D] underline the importance of even small density-dependent factors inregulating long-term population densities.
5. In 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.
[答案与考点解析]
1. 【答案】A
【考点解析】这是一道中心主旨题。本文的中心主旨句在第三段的首句。如果考生能够抓住第三段的首句就等于抓住了整篇文章的论述结构。该句中的dichotomy 就是正确选项A中的two categories。考生在解题时应首先抓住每篇文章的中心主旨句,因为这决定了对全文结构的认识以及对原文整体的把握。
2. 【答案】B
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