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【题目】When we produce rubber products, some ________ will be released. (chemistry)

【答案】chemicals

【解析】

句意:我们生产橡胶制品时,会释放一些化学物质。

根据句意理解可知,这里表达的是“化学物质”,而所给的词是chemistry是“化学”,指的是一门科目,所以空格不可以用chemistry,英语中表示“化学物质”是chemical,空格前有some修饰,所以这里应该用复数形式,故答案为chemicals

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