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The goal of secondary treatment at a municipal sewage treatment plant is: A. disinfection B. the removal of suspended organic material C. the removal of heavy metals D. the removal of soluble organic material E. the removal of nitrates and phosphates
The greatest emission of sulfur dioxide comes from: A. forest fires B. industrial manufacturing processes C. biofuels D. coal-fired power plants E. on-road vehicles (cars, trucks and buses)