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

【答案】pollution

【解析】

句意:共享自行車沒(méi)有污染,可以幫助人們?cè)诔鞘兄凶杂尚旭偂?/span>

without通常表示否定,意為“沒(méi)有、無(wú)”,其后可接名詞和動(dòng)名詞,根據(jù)句意“沒(méi)有污染”可知,此處缺的是名詞,污染的名詞形式是pollution,故答案是pollution

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