2. 外语
  3. What have made people certain of the purity of bottled water? Over a quarter of bottled water is derived from ______.

What have made people certain of the purity of bottled water? Over a quarter of bottled water is derived from ______.

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问题 What have made people certain of the purity of bottled water?
Over a quarter of bottled water is derived from ______.
选项
答案a municipal supply
解析 根据题干中的a quarter of bottled water定位到原文第二段第三句But more than 25 percent of it comes from a municipal supply.题目问的是超过四分之一的瓶装水来自于哪里。原文第二段第三句提到，超过25%的瓶装水来自于市政供水。题干中的over a quarter of是对原文more than 25 percent的同义转述，is derived from是对comes from的同义转述，故答案为a municipal supply。
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