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Unit 3 Make our world beautiful 例1 单词填空 1)The river has become very d because some factories poured waste water into it. 2)A truck collects r outside our building. 3)It is important for everyone in the world to take care of our e . 4)Don’t throw any l onto the ground. 5)We should p the animals in the world. They are our friends. 提示说明: 先看一看所缺单词在句中的作用,根据词性理解词义。 参考答案: 1)dirty 2)rubbish 3)environment 4)litter 5.protect
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