Unit 1 Growing Up 1
Unit 2 Friendship 15
Unit 3 Understanding Science 29
Unit 4 The American Drearn 43
Test Yoursdf（Units 1-4） 56
Unit 5 Wirk to Live to Work 68
Unit 6 Romance 82
Unit 7 Animall Intelligence 96
Unit 8 Educational Problems 110
Testt Yourself（Units 5-8） 125
Key to Exercises 137
Tape Scripts 159