第29题: [单项选择]What aspect of animal experimentation does the professor mainly discuss A. How harmful it is to animal protection. B. How useless it is for the medical care. C. How its development differs from that of others, D. How it develops from an early ag 参考答案:A 答案解析:[听力原文] 18-23 So today we’re gonna talk about animal experimentation. Do you know why animal exp