Passage One For what have the traditional tungsten bulbs been criticized?

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问题 Passage One
For what have the traditional tungsten bulbs been criticized?

选项

答案Their high carbon emissions．

解析第1段首句句末提到，停止使用传统钨丝灯泡，每年可减少500万吨的carbon emission，据此可知，“碳排放”就是钨丝灯备受诟病的缺点。

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专业英语四级

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