【题目】One of the biggest (挑战) the government is now faced with is how to improve the air quality.
在线课程【答案】challenges
【解析】句意：政府面临的最大的挑战之一就是怎样提高空气质量。此处是one of句型，名词用复数。所以答案是challenges.
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One of the biggest the government is now faced with is how to improve the air quality.
编辑：chaxungu时间：2026-04-27 03:01:51分类：高中英语题库
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