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。
来看个简单的例子:
例:The author suggests that, before the early 1950s, most historians who studied preindustrial Europe did which of the following?
思路:在题干中看到了1950s,第一反应就是要回原文定位,发现原文只讲到了in the early 1950s并没有before,这显然就是时间上一个取非的关系,我们把in the early 1950s干的事情取个非,就是之前干的事情。答案就很好选了,在此不举出来了。
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