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winsx2008

Fire ants from Brazil now infest the southern United States. Unlike queen fire ants in Brazil, two queens in the United States share a nest. Ants from these nests are more aggressive than those from single-queen nests. By destroying virtually all insects in the nest area, these aggressive ants gain sole access to food sources, and the ant population skyrockets. Since certain predator insects in Brazil limit the fire-ant population there, importing such predator insects into the United States would be of overall benefit to the environment by stopping the increase of the fire-ant population in the United States.

Each of the following is an assumption made in the argument EXCEPT:

(A) The imported insects would not prove more damaging to the environment in the United States than are the fire ants themselves.

(B) The predator insects from Brazil could survive in the ecological environment found in the United States.

(C) The especially aggressive fire ants from the two-queen nests would not be able to destroy the Brazilian predator insects.

(D) The predator insects would stop the increase of the ant population before the ants spread to states that are farther north.（D）

(E) The rate of increase of the fire-ant population would not exceed the rate at which the predator insects could kill the ants.

    答案d。我觉得c对，因为c说ant不会destory predator。这是反对前提了吧。既然是predator，就不会被destory 呀？

danggichen

我觉得不是反对前提啊，文章中所说的certain predator insects in Brazil limit the fire-ant population there是对one queen的那种fire ants起限制作用的predator insects，但在美国的fire ants are unlike queen fire ants in Brazil，这种fire ants是two queens，所以并不能保证来自巴西的predator insects也可以对美国的fire ants也一样起作用，也许甚至有可能会被这种especially aggressive fire ants 所destroy

这样的话，（C）选项就可以成为原文的一个假设了：）

winsx2008

谢谢楼上  知道了 没注意unlike。