英语科普阅读文选1PDF电子书下载

Contents 1

1．The Size of the Universe 1

2．The Stages of a Rocket 4

3．Mathemagic 7

4．Light 10

5．What Is It ？ 13

6．How Does Water Help Make Our Weather？ 17

7．The Speed of Sound 20

8．Expansion and Contraction of Solids 23

9．Solar Energy 27

10．Volcanoes 30

11．The English of Science 34

12．Sonar 38

13．Where Is Tomorrow？ 43

14．An Ocean of Air 47

15．Wind 51

16．Time and Calendar 54

17．Our Food 57

18．Carbon Dioxide and Respiration 61

19．Measuring Temperature 65

20．The Importance of Rivers 70

21．Why Roses Are Red 74

22．A Trip to the Moon（Ⅰ） 78

23．A Trip to the Moon（Ⅱ） 82

24．You Push It，It Pushes You 86

25．Gravitation Everywhere 90

26．Heat 94

27．Living in the Atomic Age 97

28．Dangers in Space 102

29．A Blanket for the Earth 106

30．Weight and Mass 110

31．The Sun 113

32．The Food Factory 117

33．Fresh Water Factories 122

34．The Cell，the Body'S Building Material 126

35．What Holds a Satellite in Orbit 133

36．A Ruler to the Stars 136

37．Molecules，Atoms and Particles 142

38．Atoms Work for You 146

39．The Limits of the Environment 150

40．Collecting Heat from the Sun 157