[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.
「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”?忌诮忸}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(duì)全文結(jié)構(gòu)的認(rèn)識(shí)以及對(duì)原文整體的把握。
來(lái)源:網(wǎng)絡(luò)整理 免責(zé)聲明:本文僅限學(xué)習(xí)分享,如產(chǎn)生版權(quán)問(wèn)題,請(qǐng)聯(lián)系我們及時(shí)刪除。