31、**Tree 释放 VOC 1. 为了减少污染形成haze,什么措施最没有用,least useful to achieve the government's proposal?(preserve emitting这些物质的forest in urban vicinity,near emitting这些物质的工厂,选这个,这个是背道而驰的; Vehicle那道,因为后面写汽车emission VOC,明显不对;让工厂少排放跟VOC反应的那些气体;患哮喘的人应该多呆在indoor;及时通报市民haze的浓度,让大家注意;把住宅区搬到上风向) 到底是: preserve emitting这些物质的forest in urban vicinity,near emitting这些物质的工厂 还是: Vehicle那道,因为后面写汽车emission VOC 我somehow 觉得“把住宅区搬到上风向”对 because 这两个因素是:(1) 因为与风向无关,可能会有风把工业区的毒气吹过来;但是作者说在工业区,马路附近,森林里面所测得的数据都相近, -- by 会员 poa0101 (2011/10/16 13:29:35)
Several lines of evidence suggest that the hydroxyl radicals disappeared when they reacted with unknown VOCs, the researchers suggest in the April 30 Science. For example, concentrations of hydroxyl added to air samples during tests dropped at the same rate, regardless of whether prevailing winds were bringing clean air from Canada or polluted air from urban areas. Therefore, the phantom VOCs probably hadn't been produped by human activity, says Brune. 我看了一下近似原文,觉得文章和回忆的机经有点不一样。这篇文章说Voc有一些是known的,有些是unknown的。实验中hy的减少是因为和unkown的VOC发生反应。因为hy减少的rate与clean air 还是polluted air无关,所以这些可以与hy反应的voc可能不是人类产生的。我感觉第一个答案是想说把forest搬到可以产生hy的工厂附近,因为狗主说这个选项背道而驰。把住宅区搬到上风区对haze没什么影响,题目问least useful,个人认为还是选把forest搬到产生hy工厂附近。考试时还是仔细看看文章吧。
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