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新gre考试实施以来，参加了新版gre考试的考生都觉得阅读部分的题难度增加了，这主要是由于新gre考试逻辑阅读需要考生的逻辑反应一定要比以前更快，可能考生还是有点不习惯，或是没有准备充足。那么，接下来的几天，小编将给大家搜索整理一些新gre考试逻辑阅读的练习题，希望考生能从平日的练习中总结规律，找到解题技巧。 Many theories have been formulated to explain the role of grazers such as zooplankton in controlling the amount of planktonic algae in lakes. The first theories of such grazer control were merely 5 based on observations of negative correlations between algal and zooplankton numbers. 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. The converse obser- 10 vation, of the absence of grazers in areas of high phytoplankton concentration, led Hardy to propose his principle of animal exclusion, which hypothe- sized that phytoplankton produced a repellent that excluded grazers from regions of high phytoplankton | 
