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1The 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 occurC.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 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。----------------------------------------2It can be inferred from the text that the author considers the dichotomy discussed to be A.applicable only to erratically fluctuating populations.B.instrumental, but only if its limitations are recognizedC. dangerously misleading in most circumstances.D.a complete and sufficient way to account for observed phenomena 参考答案： B 这是一道细节推导题。根据题干中的“dichotomy”可将本题的答案信息来源迅速确定在第二段的首句。如果考生能够正确理解该句中“but”一词前后的内容，就可以找出本题的正确选项B。考生在解题时一定要正确理解原文所传达的含义，即进行正确的细节推导。----------------------------------------3According to the text, all of the following behaviors have been exhibited by different populations EXCEPT A.roughly constant population levels from year to yearB.regular cycles of increases and decreases in numbersC.erratic increases in numbers correlated with the weatherD.unchecked increases in numbers over many generations 参考答案： D 这是一道审题定位与中心主旨题。根据本题题干中的“different populations”可将本题的答案信息来源确定在首段的第一句，因为该句中的“all species”实际上指的就是题干中的“different populations”。从第一段的首句入手并且仔细阅读首段的第二句，就可以找出本题的正确选
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