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。

12 A Healthy Body

12.1  How Do We Keep Our Bodies Healthy?

12.2 Food Substances

12.3 A Balanced Diet

12.4 Natural Food and Processed Food

12.5 Digestion and Absorption of Food

12.6 The Fate of the Digested Food

12.7 Our Circulatory System

12.8 Fatty Foods in Our Diet and Their Effects on

 Our Health

12.9 Exercise and Health

12.10 Need for Rest

Key to Test yourself