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Most water companies in the United States add fluoride to tap water to help prevent cavities. Some dentists argue, however, that this practice actually causes more harm than good because people overestimate the protection afforded by the fluoride and do not take the proper steps to care for their teeth, such as brushing and flossing after every meal. If water companies did not add fluoride, the dentists claim, people would be forced to be more active in their dental hygiene and tooth decay would decline as a result.

Which of the following, if true, most weakens the dentists' claims?
  • AFluoride is widely used in commercially available dental care products. 分析该选项
  • BMost Americans are not aware that fluoride is added to tap water. 分析该选项
  • CAnnual visits to the dentist are the most effective means of controlling tooth decay. 分析该选项
  • DThe United States has the lowest rate of tooth decay in the world. 分析该选项
  • E Most Americans already brush their teeth daily. 分析该选项
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正确答案: B

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