A Healthy Body健康的体魄 1
12.1 How Do We Keep Our Bodies Healthy?如何保持身体健康？ 4
12.2 Food Substances食物成分 7
12.3 A Balanced Diet均衡饮食 17
12.4 Natural Food and Processed Food天然食品和加工食品 24
12.5 Digestion and Absorption ofFood食物的消化和吸收 31
12.6 The Fate ofthe Digested Food被消化食物的归宿 42
12.7 Our Circulatory System人体的循环系统 45
12.8 Fatty Foods in Our Diet and Their Effects on Our Health膳食中的高脂食物及其对健康的影响 54
12.9 Exercise and Health运动与健康 59
12.10 Need for Rest休息的必要性 69
Key to Test yourself单元测试答案 73