⏪ 新概念英语 - [4-026] - (97版) ⏩ ⏳ 正在检测本地文件... First listen and then answer the following question.先听录音，然后回答后面的问题。What is the main condition for the preservation of the remains of any living creature? 保存任何生物遗骸的主要条件是什么？The past life of the earth 📁 请先导入本地文件， 需要帮助？点击我 ↗