目录：
Unit 1 We love nature
Lesson 1 Planting trees
Lesson 2 Talking about squirrels
Lesson 3 A book about animals
Self-assessment
Unit 2 Four seasons
Lesson 1 Seasons and clothes
Lesson 2 Seasons and months
Lesson 3 Seasons and culture
Unit 3 A birthday party
Lesson 1 Coming to my party
Lesson 2 Buying a present
Lesson 3 Having a birthday party
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