试题 试卷
题型：填空题 题类：常考题 难易度：困难
接力版（三年级起点）小学英语四年级下册Lesson 6 What is it doing? 同步习题
—What are they doing?
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Water comes from the sea, the rain and the……. How do we use water? We use water to……
例：Don't climb the tree. You may fall down.
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