Global warming refers to the average temperature of the atmosphere, oceans, and landmasses of Earth. Scientists are growing con

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问题 Global warming refers to the average temperature of the atmosphere, oceans, and landmasses of Earth.
Scientists are growing concerned about other gases produced from ______.

选项

答案manufacturing processes

解析 第3个小标题TYPES OF GREENHOUSE GASES下面最后一段第1句:Scientists are growing concerned about other gases produced from manufacturing processes that pose an environmental risk.
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