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GRE阅读模拟练习题(270)

2017-05-22 15:33:00来源：网络

　　为了帮助大家练习GRE阅读题考点，新东方在线GRE频道为大家带来GRE阅读模拟练习题一文，希望对大家GRE备考有所帮助。更多精彩尽请关注新东方在线GRE频道!

　　Soil communities are dependent on plants for organic matter. Plants provide organic matter for soil communities through the decomposition of leaf litter, by oozing nutrients from roots, or through other methods of deposition of organic compounds into the soil environment. As a result of these diverse methods by which plants supply resources, unique soil communities form under different plant species and under plant communities that differ in composition. If a nonnative plant species invades an aboveground community of flora and fauna, it can alter links between the native aboveground community and the belowground soil community. For example, an invading nonnative plant could alter the quantity of leaf litter production, which would alter nutrient contributions to the soil.

　　1. According to the passage, plants supply resources to soil communities by which of the following methods?

　　A：Some plants supply resources to soil communities by promoting diversity of aboveground flora and fauna.

　　B：Some plants supply resources to soil communities by oozing nutrients from their roots.

　　C：Some plants supply resources to soil communities by depositing leaf litter.

　　答案：BC

　　2. Which of the following statements about the connection between aboveground plants and belowground soil communities can be inferred from the passage?

　　A：Because of the nature of the link between above-and belowground communities, many soil communities are deficient in nutrients.

　　B：The extent to which soil communities are dependent on aboveground plants is extremely variable from one soil community to another.

　　C：Because different plants supply resources to soil communities in different ways, distinctive soil communities form under different plant communities.

　　答案：C

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