Unit One Travelling 1
Unit Two Space 7
Unit Three Animals 13
Unit Four Scientists 20
Unit Five Sports 26
Unit Six Water 33
Unit Seven Holidays 40
Unit Eight Learning a Language 46
Unit Nine Foreign Countries 52
Unit Ten The Internet 58
Additional Material 1 Entertainment 64
Additional Material 2 Communication 71
期中试卷 77
期末试卷 85
参考答案 93