英语 Ⅳ级 练习答案与参考译文PDF电子书下载

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