【题目】Global studies have shown how quickly these (细菌) can develop and spread.
在线课程【答案】acteria
【解析】句意：全球研究表明了这些细菌发展和传播可能有多快。these后面接可数名词复数，因此答案bacteria。
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Global studies have shown how quickly these can develop and spread.
编辑：chaxungu时间：2026-04-27 03:14:27分类：高中英语题库
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