gre考试阅读真题解析(B)_GRE阅读

gre考试阅读真题解析(B)

　　 Why Discrimination Against Employed Women by Government Employers and Private Employers Differs from Discrimination Against Self-Employed Women by Consumers

　　 How Discrimination Affects Womens Choice of Type of Employment

　　 The Relative Effect of Private Employer Discrimination on Mens Earnings as Compared to Womens Earnings

　　 The Relative Effect of Discrimination by Government Employers, Private Employers, and Consumers on Womens Earnings

　　The success of fluoride in combating dental decay is well established and, without a doubt , socially beneficial. However, fluorides toxic properties have been known for a century. In humans excessive intake over many years can lead to skeletal fluorosis, a well-defined skeletal disorder, and in some plant species, fluoride is more toxic than ozone, sulfur dioxide, or pesticides.

　　Some important questions remain. For example, the precise lower limit at which the fluoride content of bone becomes toxic is still undetermined. And while fluoride intake from water and air can be evaluated relatively easily, it is much harder to estimate how much a given population ingests from foodstuffs because of the wide variations in individual eating habits and in fluoride concentrations in foodstuffs. These difficulties suggest that we should by wary of indiscriminately using fluoride, even in the form of fluoride-containing dental products.

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