【OG24-653题】Highway Official: When resurfacing our concrete bridges, we should use electrically conductive concrete (ECC) rather than standard concrete. In the winter, ECC can be heated by passing an electric current through it, thereby preventing ice buildup. The cost of the electricity needed is substantially lower than the cost of the deicing salt we currently use.Taxpayer: But ECC is vastly more expensive than standard concrete, so your proposal is probably not justifiable on economic grounds.Which of the following, if true, could best be used by the highway official to support the official's proposal in the face of the taxpayer's objection?_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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Highway Official: When resurfacing our concrete bridges, we should use electrically conductive concrete (ECC) rather than standard concrete. In the winter, ECC can be heated by passing an electric current through it, thereby preventing ice buildup. The cost of the electricity needed is substantially lower than the cost of the deicing salt we currently use.

Taxpayer: But ECC is vastly more expensive than standard concrete, so your proposal is probably not justifiable on economic grounds.

Which of the following, if true, could best be used by the highway official to support the official's proposal in the face of the taxpayer's objection?

The use of deicing salt causes corrosion of reinforcing steel in concrete bridge decks and damage to the concrete itself, thereby considerably shortening the useful life of concrete bridges. Severe icing conditions can cause power outages and slow down the work of emergency crews trying to get power restored. In weather conditions conducive to icing, ice generally forms on the concrete surfaces of bridges well before it forms on parts of the roadway that go over solid ground. Aside from its potential use for deicing bridges, ECC might also be an effective means of keeping other concrete structures such as parking garages and airport runways ice free. If ECC were to be used for a bridge surface, the electric current would be turned on only at times at which ice was likely to form.

正确答案： A

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高速公路官员：用导电混凝土（ECC）代替标准混凝土，冬天可通电防冰，且电费远低于除冰盐费用。纳税人：但ECC比标准混凝土贵得多，所以该提议在经济上可能不合理。 逻辑链
ECC防冰cost低，本身cost高→经济上是否可行 问题类型
增强题。任务是找出能帮助高速公路官员在纳税人反对的情况下支持其提议的选项。 推理过程
官员提议用ECC，虽电费低但ECC本身贵，要在经济角度支持提议，需找到ECC在经济方面其他优势或除冰盐的经济劣势来抵消ECC本身高成本的影响。 选项分析
A选项：除冰盐会腐蚀混凝土桥梁中的钢筋并损坏混凝土本身，大大缩短混凝土桥梁的使用寿命。说明除冰盐有经济上的负面效应（后期维修等成本会增加），对比之下能体现ECC从长远看可能更经济，增强了官员提议，当选。 B选项：严重结冰状况会导致停电并减缓应急人员恢复电力的工作。与ECC和除冰盐的经济比较无关，排除。 C选项：在易结冰的天气条件下，冰在桥梁混凝土表面比在路面其他部分更早形成。只是在说冰形成的情况，未涉及经济因素，排除。 D选项：除了用于桥梁除冰，ECC还可能是保持其他混凝土结构如停车场和机场跑道无冰的有效手段。讨论的是ECC的其他用途，未针对经济合理性，排除。 E选项：如果ECC用于桥面，只有在可能结冰时才会通电。只是说明了ECC通电的时机，未对其经济合理性提供支持，排除。

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