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    Which Percentage of the U
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Which Percentage of the U

Question 47

Question 47

Multiple Choice

Which percentage of the U.S.population live in areas with dangerous levels of air pollution?​ 


A)  ​less than 10 percent 
B)  ​about 30 percent 
C)  ​more than 50 percent 
D)  ​less than 20 percent 
E)  ​nearly 90 percent

Correct Answer:

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