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【题目】Shared bikes can help people travel around freely in cities without __________________(污染).

【答案】pollution

【解析】

句意:共享自行车没有污染,可以帮助人们在城市中自由行驶。

without通常表示否定,意为“没有、无”,其后可接名词和动名词,根据句意“没有污染”可知,此处缺的是名词,污染的名词形式是pollution,故答案是pollution

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