《英语 Ⅳ级 练习答案与参考译文》

1 KEY TO THE LISTEN EXERCISES2

Lesson One No Smoking2

A Smoking Problem5

Lesson Twe Physical Fitness6

Physical Fitness Important for Children9

Lesson Three Life Span11

Roy Walford,an Expert on Aging13

Lesson Four Care Takers of Aging Parents16

Helen20

Lesson Five Our Brain21

The Left Brain24

Lesson Six Memory26

It's Important to Forget30

Lesson Seven　The Human Impact on the Environment31

Pollution in the Environment35

Lesson Eight Our Polluted Planet36

Our Polluted Planet39

Lesson Nine Some Facts About Diet41

You've Got to Slow Down44

Lesson Ten Earthquake46

How Do Animals Know When an Earthquake Is Coming?49

Lesson Eleven Black Students in American Colleges51

Student Population(News)54

Lesson Twelve Jimmy Taylor56

Jimmy Taylor60

Lesson Thirteen Violence on TV61

TV in Britain64

Lesson Fourteen Mothers Against Drunk Drivers65

The Hazards of Drunk Drivers69

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 Cycles79

Lesson Seventeen English—The International Language80

The case for English83

Lesson Eighteen English——A World Language?85

The News89

Model Listening Test(Ⅰ)90

Model Listening Test(Ⅱ)94

2 KEY TO THE READING AND WRITING EXERCISES AND TRANSLATION TEXT99

Ⅰ．Key to Exercises99

Unit 199

Unit 2100

Unit 3102

Unit 4103

Unit 5105

Unit 6106

Unit 7107

Unit 8108

Unit 9109

Unit 10110

Unit 11111

Unit 12113

Key to the Model Tests114

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