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Coal:
A) is the source of about 45 percent of the energy used today.
B) was the world's principal source of energy by the beginning of the twentieth century.
C) is no longer classified as an air pollutant.
D) is less plentiful than petroleum.
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Social Problems

Social Problems


Edition: 10th
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Using Social Problems, 10th
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Correct Slight Smile TY
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