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?

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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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