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  3. The passage gives an overview of the effects of global warming on the United Sta

The passage gives an overview of the effects of global warming on the United Sta

游客2023-08-03  65
问题 The passage gives an overview of the effects of global warming on the United States. [br] ______ are the largest source of greenhouse pollutants in the United States.
选项
答案 Power plants
解析 ______ are the largest source of greenhouse pollutants in the United States．词汇线索为largest source，定位到小标题The Sources Of Global Warming下列举的三点中发现，第一点占三分之一以上，第二点占三分之一，则第二点仅可能占不足二分之一，因此第一点为最多。
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