1 KEY TO THE LISTEN EXERCISES 2
Lesson One No Smoking 2
A Smoking Problem 5
Lesson Twe Physical Fitness 6
Physical Fitness Important for Children 9
Lesson Three Life Span 11
Roy Walford,an Expert on Aging 13
Lesson Four Care Takers of Aging Parents 16
Helen 20
Lesson Five Our Brain 21
The Left Brain 24
Lesson Six Memory 26
It's Important to Forget 30
Lesson Seven The Human Impact on the Environment 31
Pollution in the Environment 35
Lesson Eight Our Polluted Planet 36
Our Polluted Planet 39
Lesson Nine Some Facts About Diet 41
You've Got to Slow Down 44
Lesson Ten Earthquake 46
How Do Animals Know When an Earthquake Is Coming? 49
Lesson Eleven Black Students in American Colleges 51
Student Population(News) 54
Lesson Twelve Jimmy Taylor 56
Jimmy Taylor 60
Lesson Thirteen Violence on TV 61
TV in Britain 64
Lesson Fourteen Mothers Against Drunk Drivers 65
The Hazards of Drunk Drivers 69
Lesson Fifteen Dr.Mark Adams Travelling by Air(Ⅰ) 70
Dr.Mark Adams Travelling by Air(Ⅱ) 73
Lesson Sixteen How Long A Person Will Sleep? 75
Sleep Cycles 79
Lesson Seventeen English—The International Language 80
The case for English 83
Lesson Eighteen English——A World Language? 85
The News 89
Model Listening Test(Ⅰ) 90
Model Listening Test(Ⅱ) 94
2 KEY TO THE READING AND WRITING EXERCISES AND TRANSLATION TEXT 99
Ⅰ．Key to Exercises 99
Unit 1 99
Unit 2 100
Unit 3 102
Unit 4 103
Unit 5 105
Unit 6 106
Unit 7 107
Unit 8 108
Unit 9 109
Unit 10 110
Unit 11 111
Unit 12 113
Key to the Model Tests 114
Ⅱ．译文（Translation) 115
第1单元 115
第2单元 118
第3单元 120
第4单元 123
第5单元 126
第6 单元 130
第7单元 132
第8单元 136
第9单元 138
第10单元 141
第11单元 143
第12单元 147