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غير مصنف
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Unit 1-2 How are animals different from one another?
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Units 3-4 How do things change?
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Units 5-6: How are things different now from long ago?
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Units 7-8: When do we use subtraction?
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Units 9-10: How do people get along with each other?
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Units 11-12: Why should we take care of the earth?
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Units 13-14: How does music make us feel?
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Units 15-16: What makes things move?
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Units 17-18: How do we make art?
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