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【简答题】
在单级萃取器中用纯萃取剂S从A、B两组分混合溶液中提取组分A。已知萃取剂用量100kg，原料液处理量为100kg，原料中A的含量40kg，萃余液中A的质量分数为0．2，选择性系数为8。试求：组分A的萃取率。
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相关题目：
【单选题】The human HAR1F gene has an unusual number of substitutions, providing evidence of ____________ evolution. HAR1F RNA functions in the brain during neurodevelopment.
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