TPO 31 听力Lecture第4篇 第4题According to ...为什么答案是AC?

根据原文 Professor: Phosphorus is a very significant indicator that horses, large numbers of horses were being kept in the settlements. 磷浓度高的地区，马匹的数量大。所以 A 选项正确。学生问："So couldn’t the phosphorus at the Botai sites just be from the frequent use of fireplaces?"意思是：波泰遗址中磷的浓度能说明当时人们频繁使用壁炉吗？教授给予了肯定回答。所以 C 选项正确。