按照此思路定位原文三行,看到后面有这样一句话A low number of algal cells in the presence of a high number of grazers suggested, but did not prove, that the grazers had removed most of the algae。注意看插入语部分的but did not prove,这个就是缺点,取非就是prove再看五个选项:
observe high phytoplankton numbers under natural lake conditions
discover negative correlations between algae and zooplankton numbers from their field research
understand the central importance of environmental factors in controlling the growth rates of phytoplankton
make verifiable correlations of cause and effect between zooplankton and phytoplankton numbers
invent laboratory techniques that would have allowed them to bypass their field research concerning grazer control
一眼扫过去就只有一个选项在讲证明,就是D中的verifiable。所以答案选D。很快解完此题。
取非的思路还可以在强对比互取非题使用
取非的思路除了可以在虚拟语气中使用,还可以在另一种逻辑关系中使用,就是强对比的关系,也就是GRE阅读题中另一种常考题型强对比互取非题,其主要特点是:原文中有强对比的双方,题干只问及其中一方,答案是对另一方叙述的取非;或者题干和原文存在强对比要素,如典型的时间要素,答案也是对原文的叙述取非。
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