gre考试阅读真题解析(B)_GRE阅读

gre考试阅读真题解析(B)

　　 a summation of arguments presented in previous paragraphs

　　 the elimination of competing arguments to strengthen a single remaining conclusion

　　 an enumeration of advantages to biological control

　　 an expansion of the discussion from the particular example of bracken control to the general problem of government regulation

　　 an overview of the variety of factors requiring further assessment

　　21. It can be inferred from the passage that it is advantageous to choose as the biological control agent a predator that is foreign to the targeted environment for which of the following reasons?

　　 Conservation groups prefer not to favor one native species over another.

　　 All local predators have already been overwhelmed by the target species.

　　 Local predators cannot be effectively screened since they already exist in the wild.

　　 There is little risk of an artificially introduced foreign predator multiplying out of control.

　　 Native predator species are generally limited by their own predators.

　　22. It can be inferred from the passage that the screening tests performed on the biological control agent are designed primarily to determine

　　 its effectiveness in eliminating the target species

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