A.Because they have to pay for it. B.Because they think TV's commercials are insults to their intelligence. C.Because it gets all its money from advertisements. D.Because there weren't any ads on TV.
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【简答题】在以下液体药剂常用溶剂中属于极性溶剂的是()A.纯化水B.聚乙二醇C.丙二醇D.液体石蜡A. 1 B. 1 C. 1 D. 1