CONTENTS

Lesson One

Text：Gravity

Grammar：Ⅰ．句子的种类

Ⅱ．状语从句（一）

Reading Material: Gravity and Spaceship

Lesson Two

Text：The Sun，the Moon and the Stars

Grammar：Ⅰ．形容词和副词的级

Ⅱ．状语从句（二）

Reading Material：Evaporation

Lesson Three

Text：Science and Facts

Grammar：主语从句，表语从句，宾语从句，同位语从句

Reading Material：Magnets

Lesson Four

Text：A Common Element

Grammar： What引导的从句

Reading Material：Air Pressure

Text： Light

Lesson Five

Grammar：定语从句（一）

Reading Material： Atoms

Lesson Six

Text：Cloud，Fog and Dew

Grammar：定语从句（二）

Reading Material： How Heat Travels

Lesson Seven

Text：A Story About Edison

Reading Material：Different Forms of Water

Grammar：复习

Lesson Eight

Text： Radar for Peaceful Purposes

Grammar：不定式（一）

Reading Material：Watson-Watt and Radar

Lesson Nine

Text： Li Shi-zhen

Grammar：不定式（二）

Reading Material： When and How to Collect Herbs

Text：Sound Has Speed

Lesson Ten

Grammar：动名词

Reading Material：Iron Smelting

Lesson Eleven

Text： Computers

Grammar：分词（一）

Reading Material：Chemical Reaction in a Living Body

Lesson Twelve

Text：Fire

Grammar：分词（二）

Reading Material： Electric Current

Lesson Thirteen

Text：Science and Scientific Research

Grammar：复习

Reading Material：Molecules

Lesson Fourteen

Text：Electron and Atom

Grammar：虚拟语气

Reading Material：How to Put Out a Fire

Text：Something About Electrification

Lesson Fifteen

Grammar：It用法小结

R eading Material：How to Build a Fire

Lesson Sixteen

Text：Expansion and Contraction

G rammar：As用法小结

Reading Material：Four Zones of the Earth

Lesson Seventeen

Text：Supersonic Planes

Reading Material：Fission and Fusion

Grammar：复习

Supplementary Readings

1．Water in the Air

2．What Are Magnets?

3．Can People Really Make Rain?

4．Force，Work，Energy and Power

5．How Changes Are Brought Abou+?

6．China's Own Path

Word Study索引

总词汇表