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{{B}}Effects of Environmental
Pollution{{/B}} 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 per cent greater than normal for that time of year. The mass of Asian air 4 contained elevated levels of all pollutants measured. Price said, "but the only thing that cam A. they contain more pollutants than normal particles B. they move much faster in high altitudes than in low altitudes C. they are finer and lighter than normal particles D. their ability to reflect light is much than stronger 更多"{{B}}第一篇{{/B}}"的相关试题: [单项选择] {{B}}第一篇{{/B}}
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