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四十个为什么pdf电子书版本下载

四十个为什么
  • 朱饮儒著 著
  • 出版社: 上海:上海外语教育出版社
  • ISBN:7218·129
  • 出版时间:1984
  • 标注页数:154页
  • 文件大小:3MB
  • 文件页数:161页
  • 主题词:

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图书目录

Contents 1

1.What Caused the Tower of Pisa to Lean ? 1

2.Was America Discovered Before Columbus ? 5

3.Does the Whole World Have Time Zones ? 8

4.How Does a Refrigerator Produce Cold ? 12

5.What Makes anAirplane Stay up ? 16

6.What Is Radar ? 20

7.How Did Our System of Counting Begin ? 24

8.Who Discovered Electricity ? 28

9.Who Built the First Lighthouse ? 31

10.Who Discovered the Atom ? 35

11.Who Invented the Airplane ? 39

12.How Big Is the Universe ? 42

13.What Is the Milky Way ? 45

14.What Are Falling Stars ? 48

15.Where Does the Wind Come From ? 52

16.What Is Fog ? 56

17.What Is Dew? 60

18.Why Do Snowflakes Have Six Sides ? 64

19.Why Does Frost Form on Windows ? 68

20.How Does Water Change to Ice ? 71

21.What Is a Rainbow? 75

22.What Is Light ? 79

23.How Fast Does Sound Travel ? 82

24.What Is Energy ? 85

25.What Is Heat ? 89

26.What Is Friction ? 93

27.Why Does Iron Get Rusty ? 96

28.What Is an Alloy ? 99

29.What Is Petroleum ? 103

30.Why Do We Get Tired ? 107

31.What Happens When We Sleep ? 111

32.What Causes Our Dreams ? 114

33.Why Do We Laugh ? 118

34.What Is Cancer ? 121

35.Can Animals See in Color ? 125

36.Why Does a Male Bird Have Brighter Colors Than the Female ? 128

37.How Do Birds Find Their Way Home? 131

38.How Do Fish Breathe ? 135

39.Can Any Fish Live out ofWater ? 138

40.Can a Porpoise Talk ? 142

Glossary 145

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