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Which one of the following is a pure substance?
Meatless Mondays
An international campaign that encourages people to not eat meat on Mondays to improve their health and the health of the planet.
Library
A collection or building that houses books, periodicals, and sometimes films and recorded music for public or private use.
Exercise
Physical activities aimed at enhancing or maintaining physical fitness and overall health.
Alcohol
A psychoactive substance commonly found in beverages such as beer, wine, and spirits, known for its intoxicating effects.
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