前言 Part I Exercises Book I Unit One Growing Up Unit Two Friendship Unit Three Undertanding Science Unit Four The American Dream Unit Five Work to Live or Live to Work Unit Six Romance Unit Seven Animal Intelligence Unit Eight Educational Problems Book II Unit One Ways of Learning Unit Two Values Unit Three The Generation Gap Unit Four The Virtual World Unit Five Overcoming Obstacles Unit Six Women, Half the Sky Unit Seven Learning about English Unit Eight Protecting Our Environment Book III Unit One Changes in the Way We Live Unit Two Civil-Rights Heroes Unit Three Security Unit Four Imagination and Creativity Unit Five Giving Thanks Unit Six The Human Touch Unit Seven Making a Living Unit Eight Cloning Book IV Unit One Fighting with the Forces of Nature Unit Two Smart Car Unit Three Job Interview Unit Four Globalization Unit Five Never Judge by Appearance Unit Six The Pace of Life Unit Seven The 9/11 Terrorist Attacks Unit Eight Go Traveling Part II Key Book I Unit One Growing Up Unit Two Friendship Unit Three Undertanding Science Unit Four The American Dream Unit Five Work to Live or Live to Work Unit Six Romance Unit Seven Animal Intelligence Unit Eight Educational Problems Book II Unit One Ways of Learning Unit Two Values Unit Three The Generation Gap Unit Four The Virtual World Unit Five Overcoming Obstacles Unit Six Women, Half the Sky Unit Seven Learning about English Unit Eight Protecting Our Environment Book III Unit One Changes in the Way We Live Unit Two Civil-Rights Heroes Unit Three Security Unit Four Imagination and Creativity Unit Five Giving Thanks Unit Six The Human Touch Unit Seven Making a Living Unit Eight Cloning Book IV Unit One Fighting with the Forces of Nature Unit Two Smart Car Unit Three Job Interview Unit Four Globalization Unit Five Never Judge by Appearance Unit Six The Pace of Life Unit Seven The 9/11 Terrorist Attacks Unit Eight Go Traveling