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________ is (are) a source of chlorofluorocarbons. A) Human-produced chemicals B) Air conditioning C) Manufacture of plastics D) Aerosol sprays E) all of the above

/in /by

________ is (are) a source of chlorofluorocarbons.
A) Human-produced chemicals
B) Air conditioning
C) Manufacture of plastics
D) Aerosol sprays
E) all of the above

 
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