Contents 1
Ⅰ．Texts 1
Lesson One The Year 1
Lesson Two Insects 5
Lesson Three Plant，Its Parts and Their Functions 9
Lesson Four Forests Promote Rich Harvest 14
Lesson Five Soil 18
Lesson Six Climate and Crop Production 22
Lesson Seven Heavy Snow Foretells a Bumper Harvest 26
Lesson Eight Bacteria 31
Lesson Nine Water 36
Lesson Ten Combating Harmful Insects with Insects 39
Lesson Eleven How Plants Feed 41
Lesson Twelve Plants and Environment 46
Lesson Thirteen The Nature and Importance of Plants 49
Lesson Fourteen The Roots 52
Lesson Fifteen Plant Seed 58
Lesson Sixteen Time for Collecting Tree Seed 63
Lesson Seventeen Site of Nurseries 66
Lesson Eighteen Kinds of Fertilizers Used in 71
Nursery Practice 71
Lesson Nineteen Care of Seed Beds after Germination Begins…………（？）Lesson Twenty Forest Soils 78
Lesson Twenty-one Plant Ecology 84
Lesson Twenty-two Eucalypt Ecology 89
Lesson Twenty-three Loblolly Pine 96
Lesson Twenty-four Silviculture and Its Place in Forestry 102
Lesson Twenty-five Natural Forests 106
Lesson Twenty-Six Seedling Diseases 111
Lesson Twenty-seven Metamorphosis of Insects 116
Lesson Twenty-eight Selectivity of Insecticides 120
Lesson Twenty-nine Biological Control 124
Lesson Thirty Ecolog ical Habits of Forest Insects 130
Lesson Thirty-one A Letter from abroad 136
Lesson Thirty-two The Growth of Seeds 143
Lesson Thirty-three One Function of Roots 147
Lesson One General Discussion：A Dialogue 151
Reading Materials 151
Lesson Two Terminology Practice 152
Lesson Three Soil Chemicals：Reading 154
Lesson Four Terminology Practice 155
Lesson Five Nuts：A Dialogue 158
Lesson Six Farm Forestry：A Dialogue 159
Lesson Seven Forest Area and Composition 161
Lesson Eight The Main Forest Vegetation Belts around the World 162
Lesson Nine A Brief Account of China's Forestry 165
Lesson Ten Hot Snake 177
Lesson Eleven After the Fire 178
Lesson Twelve The Sacred Tree 179
Lesson Thirteen One Function of leaves 180
Lesson Fourteen Seed Dispersal：Reason 184
Ⅱ．Grammar 241
第一课 Ⅰ．英语的词类和句子组成部分；Ⅱ．人称代词；Ⅲ．疑问代词；Ⅳ．不定式；Ⅴ．一般现在时 241
第二课 Ⅰ．短语动词；Ⅱ．介词短语；Ⅲ．祈使句；Ⅳ．现在进行时Ⅴ．分数、小数和百分数 245
第三课 Ⅰ．一般将来时；Ⅱ．时刻表示法Ⅲ．动词的基本形式 249
第四课 Ⅰ．一般过去时；Ⅱ．形容词与副词的级 251
第五课 Ⅰ．现在完成时；Ⅱ．现在完成时与一般过去时的比较 255
第六课 Ⅰ．被动语态 261
第七课 Ⅰ．动词不定式 265
第八课 Ⅰ．动名词 269
第九课 Ⅰ．分词 271
第十课 Ⅰ．for＋名词（或代词宾格）＋不定式结构；Ⅱ．分词（续）；Ⅲ．构词法 274
第十一课 Ⅰ．定语从句；Ⅱ．同位语从句 278
第十二课 Ⅰ．定语从句（续）；Ⅱ．状语从句 282
第十三课 Ⅰ．句子的种类；Ⅱ．表语从句；Ⅲ．宾语从句 286
第十四课 Ⅰ．it的用法；Ⅱ．虚拟语气 289
第十五课 Ⅰ．过去进行时；Ⅱ．过去完成时 294
第十六课 Ⅰ．一般过去将来时；Ⅱ．现在完成进行时和过去完成进行时；Ⅲ．其它时态的用法 296
第十七课 Ⅰ．独立分词结构；Ⅱ．as的用法；Ⅲ．省略句 299
第十八课 Ⅰ．倒装句 302
第十九课 Ⅰ．时态呼应 304
第二十课 Ⅰ．独立成分 306