答案:C
解析:
Choice C is correct. According to the graph, petroleum usage in the US was about 33 quadrillion Btu in 1975 while coal usage was about 13 quadrillion Btu. In other words, the US used more than twice as much petroleum as it did coal.
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答案:C
解析:
Choice C is correct. According to the graph, petroleum usage in the US was about 33 quadrillion Btu in 1975 while coal usage was about 13 quadrillion Btu. In other words, the US used more than twice as much petroleum as it did coal.