They hypothesized about the population density of grazers in natural habitats by using data concerning the population density of grazers in the laboratory.
They estimated the community grazing rates of zooplankton in the laboratory by using data concerning the natural community grazing rates of zooplankton.
They estimated the natural community grazing rates of zooplankton by using data concerning the known population density of phytoplankton.
They estimated the natural community grazing rates of zooplankton by using laboratory data concerning the grazing rates of individual zooplankton species.
本题在原文中的定位为:Studies by Hargrave and Green estimated natural community grazing rates by measuring feeding rates of individual zooplankton species in the laboratory and then computing community grazing rates for field conditions using the known population density of grazers. 原句比较复杂,并且使用and then介绍操作顺序,在理解原句时要分清主要动作和次要动作,而选项中给出的句子都非常短,也就是要对原句进行压缩,找出主要动作。理解了这种变形之后,不难发现正确答案为E。
通过以上三个例子的解析我们可以看出GRE阅读并没有想象中的那么难,相反,由于很多题目的答案就是对原文句子的变形,掌握了规律之后它较之其他阅读更容易获取正确答案而且不容易发生争议。所以我们一定要牢记从原文中来,到原文中去的原则,按照问题在原文定位之后,认真分析原句句子结构,提炼出关键词语,再从五个选项中进行对照,一定能找出唯一正确的答案。
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