【OG24-699题】Many industrialized nations are trying to reduce atmospheric concentrations of carbon dioxide, a gas released by the burning of fossil fuels. One proposal is to replace conventional cement, which is made with calcium carbonate, by a new “eco-cement.” This new cement, made with magnesium carbonate, absorbs large amounts of carbon dioxide when exposed to the atmosphere. Therefore, using ecocement for new concrete building projects will significantly help reduce atmospheric concentrations of carbon dioxide.Which of the following, if true, most strengthens the argument?_mofa留学圈mofaGRE在线题库系统_GRE在线搜题_GRE题库解析_GRE真题机经_GRE课程_GRE培训机构

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Many industrialized nations are trying to reduce atmospheric concentrations of carbon dioxide, a gas released by the burning of fossil fuels. One proposal is to replace conventional cement, which is made with calcium carbonate, by a new “eco-cement.” This new cement, made with magnesium carbonate, absorbs large amounts of carbon dioxide when exposed to the atmosphere. Therefore, using ecocement for new concrete building projects will significantly help reduce atmospheric concentrations of carbon dioxide.

Which of the following, if true, most strengthens the argument?

The cost of magnesium carbonate, currently greater than the cost of calcium carbonate, probably will fall as more magnesium carbonate is used in cement manufacture. Eco-cement is strengthened when absorbed carbon dioxide reacts with the cement. Before the development of eco-cement, magnesium-based cement was considered too susceptible to water erosion to be of practical use. The manufacture of ecocement uses considerably less fossil fuel per unit of cement than the manufacture of conventional cement does. Most building-industry groups are unaware of the development or availability of eco-cement.

正确答案： D

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题干翻译
化石燃料燃烧会产生二氧化碳。一个提议是用新的“生态水泥”取代由碳酸钙制成的传统水泥。这种由碳酸镁制成的新水泥，暴露在大气中时会吸收大量二氧化碳。因此，在新的混凝土建筑项目中使用生态水泥将显著有助于降低大气中的二氧化碳浓度。 逻辑链
Eco cement → Absorb CO₂ → Lower CO₂ level 问题类型
增强题 推理过程
论点是使用生态水泥能显著降低大气中二氧化碳浓度，论据是生态水泥暴露在大气中会吸收大量二氧化碳。需要找到能进一步支持该论点的选项。 选项分析
A选项：碳酸镁成本可能下降。成本与能否降低大气中二氧化碳浓度无关，无法增强，排除。 B选项：吸收的二氧化碳与水泥反应使其增强。说的是对水泥自身强度的影响，而非对降低二氧化碳浓度的作用，排除。 C选项：以前镁基水泥易受水侵蚀。讨论的是过去镁基水泥的缺陷，与现在使用生态水泥降低二氧化碳浓度无直接关联，排除。 D选项：生态水泥生产每单位所用化石燃料比传统水泥少。生产时用化石燃料少，意味着因燃烧化石燃料产生的二氧化碳少，从生产源头减少了二氧化碳排放，补充了降低二氧化碳浓度的新论据，增强了论点，当选。 E选项：大多数建筑行业团体不知道生态水泥的发展和可用性。这与使用生态水泥能否降低二氧化碳浓度没有关系，排除。

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