这是本供教师使用的中英文双语选修教材。书本内容翔实，全部都是与生活密切相关的科学知识，且与学生的生活与学习实际非常贴近，练习取材于生活场景，反映学科发展的最新进展，学科内容交叉渗透，写作风格亲切，充满人文气息，读来轻松易懂。又有大量精美插图，富有时代性、艺术性和科学性。篇幅适中，结构合理，兼具一定的深度和广度。是学生用书的拓展和补充。

9 Space Travel

9.1  Forces

9.2  Friction

9.3 Force of Gravity

9.4 A Space Journey

9.5 Life of an Astronaut in Space

9.6 Space Exploration

Key to Test yourself

10 Common Acids and Alkalis

10.1 Common Acids and Alkalis

10.2 Testing Acids and Alkalis with Indicators

10.3 Acids and Corrosion

10.4 Acid Rain

10.5 Neutralisation

10.6 Everyday Uses of Acids, Alkalis and Neutralisation

10.7 Dangers of Acids and Alkalis

Key to Test yourself

11 Sensing the Environment

11.1 Sensing the Environment

11.2 How Do We See?

11.3 Limitations of the Eye

11.4 Defects of the Eye

11.5 How Do We Hear?

11.6 Limitations of Our Ears

11.7 Effects of Noise Pollution

11.8 Senses of Smell, Taste and Touch

11.9 The Brain and Our Senses

11.10 Responses to Stimuli

11.11 Effects of Drugs and Solvents on Our Senses

Key to Test yourself