生命科学 初级版PDF电子书下载

TO THE STUDENT 2

GREEN PLANTS 3

Introduction 5

Unit 1 Getting Started 6

Unit 2 The Seedling 13

Unit 3 Roots 22

Unit 4 Stems 28

Unit 5 Leaves 34

Unit 6 New Plants from Old Plants 44

Show What You Learned 48

ANIMALS 49

Introduction 51

Unit 1 Living Things Called Animals 52

Unit 2 A Look at the Animal Kingdom 57

Unit 3 Different Kinds of Bodies 69

Unit 4 Animal Life Cycles 76

Unit 5 Animal Lifestyles 82

Unit 6 Animals in Danger 90

Show What You Learned 94

HUMAN SYSTEMS 95

Introduction 97

Unit 1 You’re Alive 98

Unit 2 Moving Parts 105

Unit 3 Staying Alive 111

Unit 4 The Movers and Removers 118

Unit 5 Systems That Control Your Body 126

Unit 6 Creating Life 133

Unit 7 Taking Care 138

Show What You Learned 140

THE FIVE SENSES 141

Introduction 143

Unit 1 The Five Senses 144

Unit 2 The Sense of Sight 149

Unit 3 The Sense of Hearing 159

Unit 4 The Sense of Smell 167

Unit 5 The Sense of Taste 173

Unit 6 The Sense of Touch 179

Show What You Learned 186

GLOSSARY 187