CONTENTS 1
Lesson 1 Text:One of the Laws of Electricity 1
Supplementary Reading:Electricity 5
Grammar:The Compound Complex Sen-tence 6
Lesson 2 Text:Language of Mathematics 9
Supplementary Reading:The Use of Equa- tions 15
Lesson 3 Text:Man-made Earth-satellites 16
Grammar:The Complex Object,the Com-plex Subiect 21
General Review Ⅰ 27
Lesson 4 Text:Inertia 30
Supplementary Reading:Newton's Laws ofMotion 36
Grammar:The Word-order （Ⅰ） 37
Lesson 5 Text:X-rays 43
Supplementary Reading:X-rays 48
Grammar:The Word-order （Ⅱ） 50
Lesson 6 Text:Ultrasonics 54
Supplementary Reading: Bats and Su-persounds 59
Grammar:Elliptical Sentences 61
General Review Ⅱ 66
Lesson 7 Text:Atomic Structure 71
Supplementary Reading:The Nucleus 77
Grammar:The Attributive Clause （Ⅱ） 79
Lesson 8 Text:Properties of Metals 82
Supplementary Reading:Metals 87
Grammar:The Attributive Clause （Ⅲ） 89
Lesson 9 Text:The Behaviour of Gases 93
Supplementary Reading: Specific Physi-cal Properties 99
Lesson 10 Text:How Water Behaves 101
Supplementary Reading:Water 106
General Review Ⅲ 108
Appendix Ⅰ Idioms and Phrases 114
Ⅱ Vocabulary 116