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  3. What have made people certain of the purity of bottled water? At least one sample of a third of bottled water brands tested by

What have made people certain of the purity of bottled water? At least one sample of a third of bottled water brands tested by

admin2010-01-10  35
问题 What have made people certain of the purity of bottled water?
At least one sample of a third of bottled water brands tested by NRDC failed to meet
选项
答案state or industry standards
解析 根据题干中的at least one sample of a third和NRDC定位到原文第三段倒数第二句While noting that most bottled water is safe, the organization found that at least one sample of a third of the brands contained bacterial or chemical contaminants, including carcinogens(致痛物质), in levels exceeding state or industry standards.原文第三段倒数第二句提到，NRDC进行的抽样检测显示，尽管多数品牌的瓶装水没有问题，但是三分之一的品牌送检的样品中至少有一瓶样品的细菌或化学污染物(包括治癌物质)超出国家或行业标准。题干中的 failed to meet意为“未能达到…标准”，是对原文in levels exceeding...standards的转述，故答案为state or industry standards。
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