CONTENTSPRELIMINARY PARTUNIT ⅠThe English Alphabet 英语字母表 1
The Sounds in English 英语国际音标 3
Lesson One Text 5
Lesson Two Text 9
Lesson Three Text 14
Lesson Four Text 18
Lesson Five Text 24
Lesson Six Text 31
UNIT ⅡLesson Seven：Text：States of Matter 41
Lesson Eight Text：The Wonderful Worker— 50
Lesson Nine Text：The Sun’s Family 59
Lesson Ten Text：What Is an Alloy？ 70
Lesson Eleven Text：The TV Set 77
Lesson Twe lve Text：Marie Curie 88
Lesson Thirteen Text：The Surface of the Sea 100
BASIC PARTUNIT ⅢLesson Fou rteen Text：The Use of Radar 110
Lesson Fifteen Text：Coal and Oil 121
Lesson Sixteen Text：A Talk about Laser 132
UNIT ⅣLesson Seventeen Text：Something about Air 148
Lesson Eighteen Text：What Is a Sketch？ 160
Lesson Nineteen Text：Light 171
Lesson Twenty Text：Rock Salt 182
Lesson Twenty-One Text：Natural and Synthetic 193
Lesson Twenty-Two Text：Hot Metal 206
UNIT ⅤLesson Twenty-Three Text：Plastics 224
Lesson Twenty-Four Text：Sulfa Drugs 237
Lesson Twenty-Five Text：Bit s of Electricity 249
Lesson Twenty-Six Text：Sound 262
Lesson Twenty-Seven Text：The First Radio Wave 278
Lesson Twenty-Eight Text：Thomas Edison’s 293
Lesson Twenty-Nine Text：Thomas Edison’s 306
Lesson Thirty Text：Air Pollution 317
Appendix 1．Vocabulary List 分课词汇表 327
2．Reference Materials for Pronunciation 375
3．Irregular Verbs in Book One 393
上册不规则动词表4．Materials for Free Reading自由阅读材料 396
5．Elementary Words基本词汇（供初学者用） 415
6．Answers to Exercises in Book One 431
上册练习答案Index Words and Phrases Used in Book One 480