本站不提供该课本链接，目录如下：
CONTENTS
Module One Language
　　Unit1 WORDS AND THEIR STORIES
　　Unit2 MAKING SPEECHES
Module Two Friendship
　　Unit3 On Friendship
　　Unit4 Moving Stories
Module Three Exploring Nature
　　Unit5 Great Scientists
　　Unit6 Amazing achievements
Module Four Literature(1)
　　Unit7 Enjoying the Classics(1)
　　Unit8 Enjoying the Classics(2)
Appendix