目录：
Unit 1 People around us
Section 1 Experiencing and understanding language
Section 2 Exploring and applying rules (Grammar)
Section 3 Expressing and communicating ideas
Section 4 Extending and developing competencies
Focusing on culture
Cross-curricular connection
Checking your progress (Project)
Unit 2 Travelling around the world
Unit 3 Trees and us
Unit 4 Our animal friends
Unit 5 Water is life
Unit 6 Electricity everywhere
Unit 7 Role models of our time
Unit 8 Follow your interests
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