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人教版九年级下册英语Unit 13　We're trying to save the earth! Section A grammar focus 课件.ppt

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Unit 13Were trying to save the earth,Section A 3 Grammar Focus,Revision,不同种类的污染2.河底3.把垃圾扔到河里4.在中起作用,different kinds of pollution,the bottom of the river,throw rubbish into the river,play a part in,I.
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