最新美国科普短文选PDF电子书下载

CONTENTS 1

1．The Sex Change of Fish 1

2．Spider 6

3．The Asian Cockroach 11

4．The Ozone Problem 15

5．The Greenhouse Effect 20

6．The Treatment of Waste Water 24

7．Polar Bears ard Solar Heating Systems 27

8．The Utilization of Ocean Energy 35

9．The Superconducting Supercollider 40

10．The Effects ofthe Chernobyl Accident 46

11．Space Exploration 52

12．An Unusual Planet 59

13．The Mars Observer 64

14．The Markarian 348 Galaxy 68

15．A Wonderland in the Atlantic Ocean 73

16．The Temperature of the Center of the Earth 77

17．The Cause of Earthquakes 80

18．The Great Changes of the Surface of the Earth 　 85

19．New Discoveries in Antarctica 98

20．The Earliest Tools with Handles 103

21．Promising Ways of Controlling Weeds 106

22．Groundnuts（1） 111

23．Groundnuts（2） 115

24．Small Farm Grain Storage 119

25．The Prediction of the World Population 123

26．The Fear of AIDS 126

27．The Only Effective Weapon in Fighting AIDS 132

28．An AIDS-Fighting Protein 137

29．An AIDS-Fighting Drug 141

30．The Early Discovery of Cancer 145

31．A Cancer-Fighting Protein 151

32．The Proper Use of Vitamins 155

33．Home Health Tests 159

34．Passive Smoking 164

35．Osteoporosis 170

36．The Examination of the Prostate 174

37．Depression 177

38．Parkinson's Disease 181

39．Down's Syndrome 186

40．Listeriosis 190