第23题: [单项选择]Passage Two Questions 29 to 31 are based on the passage you have just heard.[A] Biology. [C] Philosophy. [B] Chemistry. [D] Medicine. 参考答案:C 答案解析:[听力原文] Which subject do the students who want to become doctors not study
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第24题: [多项选择]脂类测定最常用的提取剂有() A. 乙醚 B. 苯 C. 石油醚 D. 二甲苯 参考答案:A, C