标题: 新GRE阅读理解36套每日讨论--41（群178674184） [打印本页] 作者: 普渡哥 时间: 2011-10-17 10:42 标题: 新GRE阅读理解36套每日讨论--41（群178674184） 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) A description of a replicable experiment (B) A summary report of new findings (C) A recommendation for abandoning a difficult area of research (D) A refutation of an earlier hypothesis (E) 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作者: consciousgaze 时间: 2011-10-17 16:44
B AC作者: 普渡哥 时间: 2011-10-17 22:51
还有人有答案吗？作者: xiuyuan 时间: 2011-10-17 22:53
B A作者: jinze 时间: 2011-10-17 23:44
B AC作者: bontravail 时间: 2011-10-18 00:38
为什么我觉得是 B AB作者: 普渡哥 时间: 2011-10-18 08:39
正确答案：