【教案】仁爱版九年级上册Unit 2 Saving the Earth Topic 1 教案1
第四讲—Unit 2 Topic 1 Pollution has cased too many problems.初中英语年级九年级重难点一般过去时与现在完成时的IX分【知识储备】重点语法：一般过去时
【教案】仁爱版九年级上册Unit 2 Saving the Earth Topic 1 教案1【教案】仁爱版九年级上册Unit 2 Saving the Earth Topic 1 教案1【教案】仁爱版九年级上册Unit 2 Saving the Earth Topic 1 教案1