GRE阅读练习每日一篇(三十四)_GRE阅读

GRE阅读练习每日一篇(三十四)

　　21. According to the passage, there is currently no strain of Rhizobium that can enter into a symbiosis with

　　alfalfa

　　clover

　　maize

　　peas

　　soybeans

　　22. The passage implies that which of the following is true of the bacterial genus Rhizobium?

　　Rhizobium bacteria are found primarily in nitrogen-depleted soils.

　　Some strains of Rhizobium are not capable of entering into a symbiosis with any plant.

　　Newly bred varieties of legumes cannot be hosts to any strain of Rhizobium.

　　Rhizobium bacteria cannot survive outside the protected habitat provided by host plants.

　　Rhizobium bacteria produce some ammonia for their own purposes.

　　23. It can be inferred from the passage that which of the following was the most influential factor in bringing about intensified research on nitrogen fixation?

　　The high yields of the Green Revolution

　　The persistent upward surge in natural gas prices

　　The variety of Rhizobium strains

　　The mechanization of modern agriculture

　　The environmental ill effects of synthetic fertilizers

　　24. Which of the following situations is most closely analogous to the situation described by the author as one of nature s great ironies ?

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