⏪ 新概念英语 - [4-017] - (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 factor helped to spread the disease of myxomatosis? 什么因素帮助传播了多发性粘液瘤疾病？A man-made disease 📁 请先导入本地文件， 需要帮助？点击我 ↗