高中科普英语阅读文选PDF电子书下载

1．Dog Helps Crippled Boy 1

2．Hermit Crabs Learn What Not to Eat 3

3．Bacteria 6

4．Why Do Birds Sing? 9

5．Tornado Lifts Woman and Dog 12

6．Electricity Stops Bleeding in Humans 15

7．People Who Are Cold May Need Iron 18

8．Vitamins 21

9．What You Can Do To Save Energy 25

10．The Compass 28

11．Geothermal Energy 32

12．Microwave Ovens 36

13．Students Name New Space Shuttle 39

14．Student Invention Helps Astronauts 42

15．Cosmonaut Grows Taller in Space 45

16．Air Pollution 49

17．World Hunger 53

18．Midafternoon Naps Are Normal 57

19．Doctors Grow Brain Cells in Lab 60

20．Dolphin and Seal 63

21．How Cats Survive From High Falls 66

22．Spring Peepers 71

23．I Took a Trip into Space 75

24．Biosphere Ⅱ 78

25．Pilot Nearly Sucked out of Plane 83

26．Solar Energy 88

27．Underground Temperatures 91

28．Sonar 95

29．Scientists Make Diamonds From Sewer Gas 98

30．Friction 101

31．Smart Home Does Everything 104

32．Future Devices Will Make Life Easier 109

33．Scientists Help Save Pandas 114

34．Water Pollution 118

Key to Exercises 123