必修第一册
Unit 1 A new start
Unit 2 Exploring English
Unit 3 Family matters
Unit 4 Friends forever
Unit 5 Into the wild
Unit 6 At one with nature
必修第二册
Unit 1 Food for thought
Unit 2 Let's celebrate！
Unit 3 On the move
Unit 4 Stage and screen
Unit 5 On the road
Unit 6 Earth first
必修第三册
Unit 1 Knowing me，knowing you
Unit 2 Making a difference
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