【題目】One of the biggest (挑戰(zhàn)) the government is now faced with is how to improve the air quality.

【答案】challenges
【解析】句意：政府面臨的最大的挑戰(zhàn)之一就是怎樣提高空氣質(zhì)量。此處是one of句型，名詞用復(fù)數(shù)。所以答案是challenges.

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