求知与科学PDF电子书下载

1．The Water in Our Cities 1

2．Invisible Waves 3

3．From Steam Engines to Diesel Engines 6

4．Choosing a Place for a New Town 8

5．Languages Are Similar and Different 10

6．The Bicycle 12

7．Save the World 15

8．A Story About the Invention of the Wheel 17

9．A Story About the Invention of the Cart（Ⅰ） 21

10．A Story About the Invention of the Cart（Ⅱ） 24

11．Letters of Alphabets and Sounds 27

12．Reading Without Sight 30

13．Curiosity and Science（Ⅰ） 34

14．Curiosity and Science（Ⅱ） 36

15．Edison's First Invention 39

16．Make Science Your Life's Work 42

17．Our Weather（Ⅰ） 44

18．Our Weather（Ⅱ） 46

19．The Evolution of Life 49

20．Worlds in the Sky（Ⅰ） 52

21．Worlds in the Sky（Ⅱ） 55

22．Learning Languages Is Easy—Or Is It? 58

23．The Man Who Dared 61

24．The Computer 64

25．Saucers in the Sky 67

26．Practical Science 69

27．English：The International Language 72

28．Marie Curie，Woman Scientist 75

Glossary 79