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OpenStudy (sierra!):
Which most likely contributed least to Mexico City's air pollution? A. uranium B. coal C. oil D. natural gas
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OpenStudy (sierra!):
C or D?
OpenStudy (sierra!):
@Nnesha
OpenStudy (sierra!):
@Compassionate
OpenStudy (kash_thesmartguy):
Mostly D. @sierra!
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