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

游客2023-08-03  29

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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