北京大学试用教材 英语 4PDF电子书下载

Lesson One 1

Text:The Age of AutomationR.M.HovercraftLesson Two 10

Text:Persistence of VisionR.M.Eyes and Space-travelLesson Three 19

Text:Quantity and QualityR.M Water and LifeLesson Four 28

Text:Measuring the Earth's AttractionR.M.What Is Measurement?Lesson Five 36

Text:Geology—an Open-air ScienceR.M.What Is It You Are Standing Upon?Lesson Six 45

Text:The Past as LivingR.M.Building Upon the PastLesson Seven 54

Text:The Spider,Nature's Engineer ExtraordinaryR.M.Spiders' Other AbilitiesLesson Eight 62

Text:Your Happiness Is in Your HandR.M.Cultivating a HobbyLesson Nine 72

Text:The Nature of HypothesisR.M.The Method of Scientific InvestigationLesson Ten 79

Text:What Is Science?R.M.Pure and Applied ScienceLesson Eleven 89

Text:Paper,Compass and GunpowderR.M.Progress Is InevitableLesson Twelve 101

Text:Madame CurieR.M.RadioactivityLesson Thirteen 113

Text:Madame Curie(continued)R.M.Radioactivity(continued)Lesson Fourteen 124

Text:Why Is the Sky Dark at Night?R.M.Continuity and Harmony in ScienceLesson Fifteen 135

Text:Loose the Spring in Your MindR.M.Newton's Theory and Beethoven's MusicLesson Sixteen 145

Text:Chance and ProbabilityR.M.Mathematics and Other SciencesLesson Seventeen 156

Text:Weather WisdomR.M.The Weather and AviationLesson Eighteen 168

Text:Studying Viruses in the LaboratoryR.M.Patients and DoctorsLesson Nineteen 179

Text:The Negro ScientistR.M.The Plant MagicianLesson Twenty 191

Text:The Billiard BallR.M.Mister Imagination附：大写规则和标点符号的用法 216

总词汇表（Vocabulary） 223