Approximately how many years did it take for average preschool blood lead levels to return to their

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Approximately how many years did it take for average preschool blood lead levels to return to their 1950 levels? 


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A) 25 


B) 30 


C) 35 


D) 40

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McGraw-Hill Education SAT 2017

ISBN: 9781259641657

1st Edition

Authors: Christopher Black, Mark Anestis

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