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Q20: The highest grade of coal is<br>A)anthracite.<br>B)bituminous.<br>C)lignite.<br>D)peat.
Q49: Most water bottles are recycled.
Q69: In the vulcanization of rubber,sulfur<br>A)is inserted into
Q88: Acid rain is a major problem for
Q121: All polymers are made from synthetic sources.
Q125: The presence of nitrogen dioxide in smog
Q133: Thermoplastic polymers may be<br>A)heated and reformed.<br>B)heated, but
Q136: The smog in the Los Angeles basin
Q139: Kilauea volcano in Hawaii emits 200-300 tons
Q140: The World Health Organization estimates that over