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在2009年真题第一篇阅读中，有这么一个句子This could be a factor in enhanced intelligence, as fish often contain essential fatty acids that have been linked to brain development.其中，A be a factor in B意为“A是B的原因”，后边as引导原因状语从句，be linked to又是一种表示因果逻辑的短语；同时enhanced intelligence本质相当于the enhancement of intelligence，这也不难理解在之后的阅读中我们会频繁看到increased economy类似这样v-ed+n.的结构了，就这类句式的仿写有：
Climate change is a factor in environmental degradation, unraveling the correlation between human activity and the health of the planet.其中unravel意为阐释；说明。
学会了吗？
