《气象万千生物大世界》求取 ⇩

ANIMALS1

动物35

Introduction3

导言37

How animals are put into groups3

怎样给动物分类37

Invertebrates4

无脊椎动物38

Protozoans5

原生动物38

Coelenterates5

腔肠动物38

Platyhelminthes or flatworms5

扁形动物或扁虫38

Nematodes or roundworms6

线虫或蛔虫39

Annelids or ringed worms6

环节动物或环节蠕虫39

Arthropods8

节肢动物39

Myriapods8

多足纲动物40

Arachnids9

蛛形纲动物40

Crustaceans9

甲壳纲动物40

Insects9

昆虫纲动物40

Molluscs16

软体动物43

Echinoderms17

棘皮动物43

Vertebrates17

脊椎动物43

Fishes18

鱼类44

Amphibians20

两栖动物44

Reptiles27

爬行动物47

Birds29

鸟类47

Mammals31

哺乳动物48

PLANTS51

植物89

Introduction33

导言91

Types of plants53

植物的种类91

Parts of a flowering plant54

开花植物的组成部分92

Plants have different types of leaves66

植物有不同类型的叶子92

Plants have different types of stems61

植物有不同类型的茎94

Plants have different types of roots62

植物有不同类型的根95

Plants have flowers64

植物有花朵96

Flowers become fruits70

花朵长成果实98

Plants grow from seeds74

种子生长发育成植株99

Non-flowering plants78

无花植物100

Coniferous trees78

针叶树100

Ferns79

蕨类植物101

Mosses and liverworts79

苔藓和地钱101

Algae79

藻类植物101

Fungi80

真菌101

What plants need to grow well80

植物要生长得繁盛需要些什么102

Green plants make food83

绿色植物制造养料102

Leaves give out water86

叶子挥发水分104

MAN107

人类141

Introduction109

导言143

The bones109

骨骼143

The joints111

关节144

The muscles114

肌肉145

The eye116

眼睛146

The ear120

耳朵147

The teeth123

牙齿148

Digestion126

消化150

Respiration129

呼吸151

The removal of waste products133

废物的清除152

Circulation of blood136

血液循环153

The nervous system137

神经系统154

The endocrine system139

内分泌系统155

ANIMALS AND THEIR YOUNG157

动物及其后代187

Introduction159

导言189

The egg and the sperm160

卵子和精子189

How a young aninmal is made162

幼小动物是如何产生的190

The young of fishes164

幼鱼190

The young of frogs167

幼蛙191

The young of reptiles170

爬行动物的幼体191

The young of birds172

幼禽192

The young of rabbits177

幼兔193

Only the same types of animals can mate180

together180

只有同种动物才能交配194

The gestation period180

怀孕期195

How human babies are born182

人是如何出生的196