【单选题】【消耗次数：1】
When we visited Rome, we went on a ( ) of all the historic sites.
①
technician
②
attorney
③
balcony
④
tour
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______________ , we went home.
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质点大小在1-100nm范围的分散相分散在适宜分散介质中制成的液体制剂，称为（ ）。
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