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.

參考答案：A

　　「解析」這是一道中心主旨題。本文的中心主旨句在第三段的首句。如果考生能夠抓住第三段的首句就等于抓住了整篇文章的論述結(jié)構(gòu)。該句中的“dichotomy”(兩分法) 就是正確選項(xiàng)A中的“two categories”�？忌�在解題時(shí)應(yīng)首先抓住每篇文章的中心主旨句，因?yàn)檫@決定了對全文結(jié)構(gòu)的認(rèn)識(shí)以及對原文整體的把握。

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