目录：
封面/前言/目录
Unit 1 Growing up
Unit 2 My summer holiday
Unit 3 Healthy or unhealthy?
Revision 1
Project 1
Unit 4 Our neighbours
Unit 5 Animals in danger
Unit 6 E-friends
Revision 2
Project 2
Unit 7 Seeing a film
Unit 8 Visiting museums
Unit 9 Great cities of the world
Revision 3
Project 3
Unit 10 Air
Unit 11 Trees
Unit 12 The Earth
Revision 4
Project 4
单词表
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