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简答题
6、The pollution of groundwater by nitrates(硝酸盐)is of concern to public health authorities and environmental organizations because high nitrate concentration(高硝酸含量)s in drinking water can cause methaemoglobinaemia(高铁血红蛋白血)in infants.Another environmental problem associated with high nitrate concentration in groundwater is eutrophication(富营养化)of receiving waters(供水).Virtually all decisions about the control of nitrate pollution of ground water are made in the face of uncertainties that frustrate(阻止，挫败)efforts to guarantee the desired results.The decisions also have to be made in an adversarial(意见相左，敌对不可调和的)environment in which the goals of society and those of the agricultural sector(农业部门)are often different.
答案解析
正确答案：答：地下水被硝酸盐所污染这一问题是公共卫生部门和各环保机构共同关注的一件大事，因为饮用水的高含量硝酸盐会造成幼儿高铁血红蛋白血。与地下水高含量硝酸盐有关的另一环境问题是供水源富营养化。实际上，迄今为止所有关于控制地下水硝酸盐污染的决策都面临各种不确定因素，致使多种努力(计划，或措施)落空(受阻)，难以达到期望的结果。尽管在这个问题上站在各自的立场，社会和农业部门的意见相左，这些迥异的决策仍须做出。
