9 Space Travel 太空旅行
9.1 Forces 力
9.2 Friction 摩擦力
9.3 Force of Gravity 重力
9.4 A Space Journey 太空旅行
9.5 Life of an Astronaut in Space 宇航员的太空生活
9.6 Space Exploration 太空探测
Key to Test yourself 单元测试答案
10 Common Acids and Alkalis 常见的酸和碱
10.1 Common Acids and Alkalis 常见的酸和碱
10.2 Testing Acids and Alkalis with Indicators 用指示剂检测酸和碱
10.3 Acids and Corrosion 酸及腐蚀作用
10.4 Acid Rain 酸雨
10.5 Neutralisation 中和作用
10.6 Everyday Uses of Acids, Alkalis and Neutralisation 日常生活中酸、碱及中和作用的应用
10.7 Dangers of Acids and Alkalis 酸和碱的危险性
Key to Test yourself 单元测试答案
11 Sensing the Environment 感知环境
11.1 Sensing the Environment 我们是怎样看到东西的?
11.2 How Do We See? 我们是怎样看到东西的?
11.3 Limitations of the Eye 眼睛的局限
11.4 Defects of the Eye 眼睛的缺陷
11.5 How Do We Hear? 我们是怎样听到声音的?
11.6 Limitations of Our Ears 耳朵的局限
11.7 Effects of Noise Pollution 噪音污染的后果
11.8 Senses of Smell, Taste and Touch 嗅觉、味觉和触觉
11.9 The Brain and Our Senses 脑和我们的感觉
11.10 Responses to Stimuli 对刺激的反应
11.11 Effects of Drugs and Solvents on Our Senses **和溶剂对感觉的影响
Key to Test yourself 单元测试答案