题目

Filing roofs with plants and dirt can help pull a modest amount of heat-trapping carbon dioxide(二氧化碳) out of the atmosphere, found by a new study.While green roofs certainly won't solve the global warming problem, their ability to absorb greenhouse gases—even just a little bit—supports the case for planting them on city buildings, despite extra costs on the front end, said lead researcher Kristin Getter, of Michigan State University in East Lansing."The key to fighting global warming is capturing carbon from the atmosphere and storing it in new reservoirs that weren't storing carbon before," Getter said. "In the whole scheme of things, green roofs are not the one answer to sequestering carbon, but they will certainly help." Green roofs offer a long list of known benefits. They lower air-conditioning costs in the summer by absorbing and reflecting heat. They lower heating costs in the winter by adding extra isolation.Green roofs appeal to cities because they soak up rainwater, making excess storm-water less likely to flood sewage(下水道) systems and increase sewage treatment costs. Plant-filed roofs make urban areas less likely to become heat islands. They reduce air pollution and noise pollution. And plants, even when it's several stories up, provides living places for animals.50. What's the main idea of the passage?A. How to fight the global warming problem.B. The benefits and cost of a green roof.C. A green roofs ability to absorb carbon dioxide.D. A green roofs ability to soak up rainwater.

Filing roofs with plants and dirt can help pull a modest amount of heat-trapping carbon dioxide(二氧化碳) out of the atmosphere, found by a new study. While green roofs certainly won't solve the global warming problem, their ability to absorb greenhouse gases—even just a little bit—supports the case for planting them on city buildings, despite extra costs on the front end, said lead researcher Kristin Getter, of Michigan State University in East Lansing. "The key to fighting global warming is capturing carbon from the atmosphere and storing it in new reservoirs that weren't storing carbon before," Getter said. "In the whole scheme of things, green roofs are not the one answer to sequestering carbon, but they will certainly help." Green roofs offer a long list of known benefits. They lower air-conditioning costs in the summer by absorbing and reflecting heat. They lower heating costs in the winter by adding extra isolation. Green roofs appeal to cities because they soak up rainwater, making excess storm-water less likely to flood sewage(下水道) systems and increase sewage treatment costs. Plant-filed roofs make urban areas less likely to become heat islands. They reduce air pollution and noise pollution. And plants, even when it's several stories up, provides living places for animals. 50. What's the main idea of the passage? A. How to fight the global warming problem. B. The benefits and cost of a green roof. C. A green roofs ability to absorb carbon dioxide. D. A green roofs ability to soak up rainwater.

题目解答

答案

本文主要讨论了绿色屋顶在吸收二氧化碳方面的潜力，同时提到其多种其他益处。根据第一段，研究发现绿色屋顶能吸收一定量的二氧化碳，尽管无法解决全球变暖问题，但有助于碳封存。第二段进一步说明绿色屋顶的多重好处，包括降低空调和取暖成本、减少雨水径流、缓解热岛效应、净化空气等。综合来看，文章核心在于绿色屋顶吸收二氧化碳的能力，而非其成本或雨水吸收功能。 A项“如何应对全球变暖”不符合，因文章未提供解决方案。 B项“绿色屋顶的益处与成本”不完全准确，因重点不在成本。 C项“绿色屋顶吸收二氧化碳的能力”最贴合主旨。 D项“绿色屋顶吸收雨水的能力”仅是次要内容。 答案：C. A green roof's ability to absorb carbon dioxide.

解析

本题考查对文章主旨的理解和归纳能力。解题思路是先通读全文，了解文章大致内容，然后分析各段落的重点，最后综合各段落内容确定文章的主旨。

  1. 通读全文可知，文章主要围绕绿色屋顶展开，提到了绿色屋顶能吸收二氧化碳以及绿色屋顶的多种其他好处。
  2. 分析第一段，重点在于绿色屋顶能吸收一定量的二氧化碳，有助于碳封存。
  3. 分析第二段，提到了绿色屋顶的多种好处，如降低空调和取暖成本、减少雨水径流、缓解热岛效应、净化空气等，但这些好处都是围绕绿色屋顶吸收二氧化碳这一核心展开的。
  4. 综合各段落内容，文章的主旨是绿色屋顶吸收二氧化碳的能力。
  5. 分析各选项：
    • A选项“如何应对全球变暖问题”，文章未提供解决方案，不符合文章主旨。
    • B选项“绿色屋顶的益处与成本”，文章重点不在成本，不完全准确。
    • C选项“绿色屋顶吸收二氧化碳的能力”，最贴合文章主旨。
    • D选项“绿色屋顶吸收雨水的能力”，仅是次要内容，不符合文章主旨。