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　　Three years ago, because of flooding at the Western Palean Wildlife Preserve, 100 lions and 100 western gazelles were moved to the East Palean Preserve, an area that is home to most of the same species that are found in the western preserve, though in larger numbers, and to the eastern gazelle, a close relative of the western gazelle. The only difference in climate is that the eastern preserve typically has slightly less rainfall. Unfortunately, after three years in the eastern preserve, the imported western gazelle population has been virtually eliminated. Since the slight reduction in rainfall cannot be the cause of the virtual elimination of western gazelle, their disappearance must have been caused by the larger number of predators in the eastern preserve.

　　Write a response in which you discuss what specific evidence is needed to evaluate the argument and explain how the evidence would weaken or strengthen the argument.

　　新东方GRE教师宁立波老师的思路梳理：

　　1. the only difference in climate may make different plants and grass not fit for gazelles from west

　　2. predators may prey on animals other than gazelles

　　3. we know nothing about the possible change in number of these predators, so the total number of all the predator and prey might both be in decline due to reasons like air and water pollution

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