| Scientists watched closely last spring
as a haze of pollution, which had been tracked by satellite as it crossed the
Pacific Ocean, settled over a large swath of North America from Calgary, Canada,
into Arizona. Now it appears that, for the first time, researchers on both sides
of the Pacific took detailed measurements of the same plume, a cloud that
contained Gobi desert dust as well as hydrocarbons from industrial
pollution. Heather Price, a University of Washington doctoral student in chemistry, found that the amount of light reflected by the particles in the air was more than 550 percent greater than normal for that time of year. The mass of Asian air contained elevated levels of ail pollutants measured. Price said, "but the only thing that came close to being alarming was the level of particulate matter." The haze th A. of moisture over Calgary, Canada B. developing over Pacific Ocean C. of industrial pollutants D. of desert dust and hydrocarbons 更多"{{B}}第二篇{{/B}} Scientis"的相关试题:我来回答: 提交
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