2. 外语
  3. The passage gives an overview of the effects of global warming on the United States. ______ are the largest source of greenhous

The passage gives an overview of the effects of global warming on the United States. ______ are the largest source of greenhous

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问题 The passage gives an overview of the effects of global warming on the United States.
______ 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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大学英语四级

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