LESSOM ONE 1
Text:Australia and the United States:A Comparison 1
Dialogue 5
Grammar：句子类型（Types of Sentences） 5
Word Study:have,begin 8
Exercises 10
LESSON TWO 18
Text:How Plants and Animals Help Each Other 18
Dialogue 22
Grammar：状语从句（The Adverbial Clause）Ⅰ 23
Word Study:come,go 25
Exercises 27
LESSON THREE 36
Text:Can a Computer Think? 36
Dialogue 39
Grammar：形容词和副词的级（The Degrees of Com-parison of the Adjective and the Adverb） 40
Word Study:make,think 43
Exercises 46
LESSON FOUR 53
Text:Television:Blessing or Curse 53
Dialogue 58
Grammar：Ⅰ．动词非谓语形式（The Non-finite Forms of the Verb） 58
Ⅱ．动词不定式（The Infinitive）Ⅰ 59
Word Study:talk,get 61
Exercises 63
LESSON FIVE 69
Text:Polar Bears 69
Dialogue 72
Grammar：定语从句（The Attributive Clause）Ⅰ 73
Word Study:see,meet 75
Exercises 78
LESSON SIX 83
Text:The Museum of Failures 83
Dialogue 86
Grammar：宾语从句（The Object Clause） 87
Word Study:find,play 90
Exercises 92
Revision Examination(Lessons 1—6) 98
LESSON SEVEN 103
Text:The Maid 103
Dialogue 107
Grammar：Ⅰ．过去进行时（The Past Continuous Tense） 108
Ⅱ．一般过去将来时（The Past Future Indefinite Tense） 109
Word Study:remember,want 110
Exercises 112
LESSON EIGHT 119
Text:The Yard Worker 119
Dialogue 123
Grammar：Ⅰ．现在完成时（The Present Perfect Tense） 124
Ⅱ．过去完成时（The Past Perfect Tense） 127
Word Study:help,put 128
LESSON NINE 139
Text:Keeping Fit 139
Dialogue 143
Grammar：Ⅰ．主语从句（The Subject Clause） 144
Ⅱ．表语从句（The Predicative Clause） 146
Ⅲ．同位语从句（The Appositive Clause） 146
Word Study:spend,become 147
Exercises 149
LESSON TEN 154
Text:American Taxes 154
Dialogue 157
Grammar：被动语（The Passive Voice）Ⅱ 158
Word Study:feel,pay 161
Exercises 164
LESSON ELEVEN 170
Text:The Unicorn in the Garden 170
Dialogue 174
Grammar：分词（The Participle）Ⅰ 175
Word Study:look,say 178
Exercises 180
LESSON TWELVE 189
Text:A Winter to Remember 189
Dialogue 193
Grammar：动名词（The Gerund）Ⅰ 194
Word Study:buy,keep 198
Exercises 200
Revision Examination(Lessons 7—12) 207
Supplementary Reading 212
1．Young People and Older People 212
2．The Coconut Tree 214
3．Man Has a Big Brain 216
4．Advertising and Its Value 217
5．Everyone Has a Daily Energy Cycle 219
6．Ginseng 222
7．Bridge Builder 225
8．Doing His Job 228
9．Living a Long Life 230
10．Plastic Poison 232
11．The Midnight Visitor 236
12．Clean Your Room 239
Vocabulary（词汇表） 244