《科技英语自学课本 下》求取 ⇩

Lesson 11

Text:How Nature Breaks Rocks1

Reading Materials9

Ⅰ．Weight On and Off the Earth9

Ⅱ．Falling Bodies and Their Weight14

Lesson 217

Text:Star Wars-and Einstein17

Reading Materials25

Ⅰ．Atomic Clocks25

Ⅱ．Physical and Chemical Changes28

Lesson 331

Text:Christopher Columbus31

Reading Materials39

Ⅰ．Columbus and America39

Ⅱ．The Travels ofMarco Polo42

Lesson 446

Text:Plants46

Reading Materials53

Ⅰ．Save the World53

Ⅱ．Early Plant Life-the Algae55

Lesson 558

Text:Spare Parts for Human Body58

Reading Materials66

Ⅰ．What Is Cancer?66

Ⅱ．Permeability69

Lesson 672

Text:Temperatures and Thermometers72

Reading Materials81

Ⅰ．What Is Heat?81

Ⅱ．Can We'Make'Energy?84

Lesson 786

Text:Animals in Danger86

Reading Materials93

Ⅰ．Why Does a Male Bird Have Brightercolors than the Female?93

Ⅱ．Food Chains96

Lesson 898

Text:Dealing with Radiation Dangers98

Reading Materials105

Ⅰ．Matter and Energy105

Ⅱ．Radiant Energy109

Lesson 9112

Text:Through the Earth's Crust112

Reading Materials120

Ⅰ．The Interior of the Earth120

Ⅱ．Mineral Oil124

Lesson 10128

Text:Refrigeration and Refrigerators128

Reading Materials135

Ⅰ．How Does a Refrigerator Produce Cold?135

Ⅱ．Protection of Food Against Bacterial Action138

Lesson 11141

Text:A Warmer or A Colder Earth?141

Reading Materials148

Ⅰ．Climate and Vegetation148

Ⅱ．What People Don't Know about Air151

Lesson 12155

Text:The Value of Transistors155

Reading Materials163

Ⅰ．Microelectronics163

Ⅱ．Transistor166

Lesson 13170

Text:Alfred Nobel-A Man of Contrasts170

Reading Materials178

Ⅰ．How Scientists Work178

Ⅱ．Abilities182

Lesson 14187

Text:Metals and Ores187

Reading Materials196

Ⅰ．How We Use Metals196

Ⅱ．Hot Metal200

Lesson 15203

Text:The Story of Eyes203

Reading Materials211

Ⅰ．Can Animals See in Color?211

Ⅱ．Bees and Colour214

Vocabulary217