Before the 1980s, chlorofluorocarbons (CFCs) were primarily used as ____.

A. ingredients in fire extinguishers and propellants in aerosol cans
B. coolants in air conditioners and industrial solvents
C. buoyancy gas in blimps
D. ingredients in bleach and propellants in aerosol cans
E. coolants in air conditioners and propellants in aerosol cans


Answer: E

Environmental & Atmospheric Sciences

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