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题型:填空题 题类:常考题 难易度:普通
仁爱科普版九年级上Unit 2 Saving the earth. Topic 3 What can we do to protectthe environment同步练习
—________if you can't understand the language there.
— I think it's _________, but some people think it's so _________.
— No, I think it's _________.
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