________ of secondhand smoke can be harmful.
A. Even low levels
B. Only high levels
C. Neither of the above
D. Both A and B
EVEN LOW LEVELS of secondhand smoke can be harmful.
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Asked 4/3/2013 3:12:44 PM
Updated 7/11/2015 2:34:28 AM
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selymi [7/11/2015 2:34:28 AM]
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