新GRE逻辑阅读 每日一练21

　　编辑点评： GRE阅读考试的材料，非常强调逻辑的关系，所以逻辑要点是大家在解GRE阅读题的时候的关键，本文就为大家例举了这样一篇逻辑短文，供大家参考和练习。

　　随着GRE阅读考试的难度日益增加，大家需要有针对性地进行练习，本文为大家例举的就是逻辑短文的练习，文末还附有答案，供大家更好地练习。

　　Mycorrhizal fungi infect more plants than do any other fungi and are necessary for many plants to thrive, but they have escaped widespread investigation until Line recently for two reasons. First, the symbiotic association 5 is so well-balanced that the roots of host plants show no damage even when densely infected. Second, the fungi cannot as yet be cultivated in the absence of a living root. Despite these difficulties, there has been important new work that suggests that this symbiotic association 10 can be harnessed to achieve more economical use of costly superphosphate fertilizer and to permit better exploitation of cheaper, less soluble rock phosphate.

　　Mycorrhizal benefits are not limited to improved phosphate uptake in host plants. In legumes, 15 Mycorrhizal inoculation has increased nitrogen fixation beyond levels achieved by adding phosphate fertilizer alone. Certain symbiotic associations also increase the host plant s resistance to harmful root fungi.

　　8. Which of the following most accurately describes the passage?

　　A description of a replicable experiment

　　A summary report of new findings

　　A recommendation for abandoning a difficult area of research

　　A refutation of an earlier hypothesis

　　A confirmation of earlier research For the following question, consider each of the choices separately and select all that apply

　　9. It can be inferred from the passage that which of the following has NOT been a factor influencing the extent to which research on mycorrhizal fungi has progressed?

　　□A Lack of a method for identifying mycorrhizal fungi

　　□B Difficulties surrounding laboratory production of specimens for study

　　□C Difficulties ensuing from the high cost and scarcity of superphosphate fertilizers

　　答案：B/AC

　　上文的题目大家答对了几题?大家不仅要多做题，更要善于总结，这样才会有针对性地提高。

　　GRE词汇是GRE考试的基础，只有你在保证基础的情况下，才会取得好成绩，下面就给大家具体介绍记忆GRE词汇的新方法。