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单选题 The major component in natural gas is? ( )
学科：环境保护与可持续发展
时间：2026-04-27 00:41:14
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题目2判断题
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Charcoal fires from thousands of home are nonpoint sources for air pollution. ( )A. 对B. 错
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题目5单选题
The major component in natural gas is? ( )A. Carbon dioxideB. Sulfur dioxideC. MethaneD. Nitrogen dioxide
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题目7判断题
Ozone layer is in troposphere. ( )A. 对B. 错
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