初中科普英语阅读文选PDF电子书下载

1．THE PLANTS ON MARS 1

2．THE CITY THAT GREW IN A LAKE 3

3．THE FISH ON THE MOUNTAIN 6

4．THE LEAF THAT TELLS A STORY 9

5．LIFE IN THE SOIL 11

6．WHAT ARE HUMANS 14

7．HOW THE SPECIES WERE RELATED 17

8．THE EYES 19

9．A RIVER OF ICE 22

10．THE RIVER DELTA 24

11．THE MOVING HILL 27

12．ELECTRICITY 29

13．A HORSE NO BIGGER THAN A CAT 32

14．THE NEVER-ENDING CYCLE 34

15．DESTROYED WET LANDS 36

16．A STONE FOR A SHEEP 39

17．A WAY TO REMEMBER 41

18．TEARS 44

19．THE ROPE STRETCHERS 46

20．LEARNING FROM PREHISTORIC PEOPLE 48

21．SOMETHING FOR NOTHING 51

22．MAGNETIC FIELD 53

23．THE ANIMAL WITHOUT A HEAD 57

24．FEWER BIRTHS 59

25．SIXTEEN LEFT FEET 62

26．A LEG WALKING RIGHT 64

27．HOW TO EXERCISE 66

28．NOT MADE FOR SWIMMING 69

29．THE FROG THAT CHANGES COLOR 72

30．WHAT IS SOIL MADE UP OF 75

31．DOES YOUR SKIN FIT 78

32．EAR AND SOUND 80

33．PYTHON,THE WORLD'S LONGEST SNAKE 82

34．PET FROM THE STONE AGE 85

35．WATER 88

36．THE COMPASS 91

37．WATER OFF A DUCK'S BACK 94

38．THE LAND OF DRIPPING WATER 97

39．GREEN PLANTS MAKE FOOD 100

40．A NEW KIND OF FARM 103

41．HURAKAN,GOD OF THE BIG WIND 105

42．WEATHER THE WAY WE WANT IT 107

43．THE RIVER IN THE OCEAN 110

44．ONE KILOMETRE IN THREE SECONDS 112

45．COMPUTER 114

46．HOW TO FIND FISH IN THE OCEAN 117

47．AIR 120

48．POLLUTED WATER SUPPLIES 123

49．A THREAD 100 MILES LONG 126

50．THE COLOR OF THE SMOKE 128

51．AIDS VIRUS 131

52．LIGHT 134

53．HOW HEAT TRAVELS 137

54．WHAT COLOR IS THE SUNLIGHT 140

55．BIRDS 143

56．THE ROLES OF YOUR BRAIN 145

57．KINETIC ENERGY AND POTENTIAL ENERGY 148

58．COMPUTER VIRUSES 151

59．SATELLITES 154

60．INSECTS 156

KEY TO EXERCISES 159

APPENDIX 162