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Currently,the main benefit of using corn-based ethanol in the United States is
Q1: In the United States,the electricity generated by
Q33: Currently,the greatest supply of natural gas in
Q40: In the last 50 years,the greatest progress
Q41: About how much of the sun's radiation
Q51: Which of the following should not be
Q56: Devastating earthquakes struck Haiti in January 2010,forcing
Q59: Which one of the following best illustrates
Q80: Although the Green Revolution has greatly reduced
Q81: A new food preservative has been discovered
Q89: The device in this image is responsible