托福official32听力conversation1 Plant Colonization原文解析+翻译音频

用题干关键词"disturbance"定位到第1段第4句话：Success in colonization depends to a great extent on there being a site available for colonization – a safe site where disturbance by fire or by cutting down of trees has either removed competing species or reduced levels of competition and other negative interactions to a level at which the invading species can become established. 这里说了，通过火灾和砍伐的干涉要么消除竞争对手要么降低竞争的强度。这和 A 选项中的 eliminates competition 呼应。B 选项的 increase negative interations 和原文 reduced other negative interations 相反，所以错；C 说反；D 在原文无提及。