The author of the text is primarily concerned with

The author of the text is primarily concerned with

　　[A] discussing two categories of factors that control population growth and assessing their relative importance.

　　[B] describing how growth rates in natural populations fluctuate over time and explaining why these changes occur.

　　[C] proposing a hypothesis concerning population size and suggesting ways to test it.

　　[D] posing a fundamental question about environmental factors in population growth and presenting some currently accepted answer.

参考答案：A

　　「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”(两分法) 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。

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