📚 Year 7 Cambridge Science: Interdisciplinary Integrated Question Training | 剑桥七年级科学：跨学科综合题型训练
In Cambridge Lower Secondary Science, questions often combine ideas from biology, chemistry and physics. Learning to think across these subjects helps you see how science explains the world around us. This article will guide you through typical interdisciplinary question types and show you how to use knowledge from different areas to give full, accurate answers.
在剑桥初中科学课程中，题目常常将生物学、化学和物理学的概念结合在一起。学会跨学科思考能帮助你理解科学如何解释我们周围的世界。本文将引导你了解典型的跨学科题型，并展示如何运用不同领域的知识给出完整、准确的答案。
1. Understanding Interdisciplinary Questions | 理解跨学科问题
Interdisciplinary questions ask you to link facts from more than one branch of science. For example, a question about breathing might need biology (lungs and gas exchange) and chemistry (oxygen and carbon dioxide). Sometimes physics concepts like pressure or diffusion are also needed. Always read the question carefully and identify which science topics are involved.
跨学科问题要求你将科学中多个分支的知识联系起来。例如，一个关于呼吸的问题可能需要生物学（肺和气体交换）以及化学（氧气和二氧化碳）的知识。有时候，诸如压强或扩散等物理概念也会涉及。务必仔细阅读题目，找出涉及了哪些科学主题。
In Year 7, you have studied cells, states of matter, forces, energy, acids and alkalis, and many other topics. When you practise, try to make connections: how does the particle model explain both diffusion in cells and evaporation from a puddle? How is energy stored in food related to respiration and to the thermal energy we measure?
在七年级，你已经学习了细胞、物质的状态、力、能量、酸和碱以及许多其他主题。在练习时，尝试建立联系：粒子模型如何同时解释细胞中的扩散和水坑里的蒸发？食物中储存的能量如何与呼吸作用以及我们测量的热能相关联？
2. Example 1: The Water Cycle and Purification | 示例一：水循环与净化
Question: Explain why sea water evaporates more slowly on a cold day. Then describe one way to obtain pure water from sea water and name the change of state involved.
问题：解释为什么在冷天海水蒸发得更慢。然后描述一种从海水中获得纯水的方法，并说出涉及的状态变化。
Interdisciplinary link: Physics of particles and energy (temperature and evaporation); chemistry of separation techniques (distillation); geography/Earth science (water cycle).
跨学科联系：粒子与能量的物理学（温度和蒸发）；分离技术的化学（蒸馏）；地理/地球科学（水循环）。
On a cold day, particles in the water have less kinetic energy. Fewer particles have enough energy to escape from the liquid surface, so the rate of evaporation decreases. (Physics)
在冷天，水中的粒子动能较小。具有足够能量从液体表面逸出的粒子更少，因此蒸发速率降低。（物理）
To obtain pure water from sea water, we can use distillation. The sea water is heated until it boils. The water vapour rises, leaving salt behind. Then the vapour is cooled and condenses back into liquid water. The change of state from liquid to gas is boiling (vaporisation), and from gas to liquid is condensation. (Chemistry)
要从海水中获得纯水，我们可以使用蒸馏。将海水加热至沸腾，水蒸气上升，盐被留下。然后蒸气冷却并凝结回液态水。从液体到气体的状态变化是沸腾（汽化），从气体到液体是凝结。（化学）
3. Example 2: Food and Energy Transformation | 示例二：食物与能量转换
Question: A bar of chocolate has a label that says it contains 500 kJ of energy. Explain how this energy becomes available to your muscle cells and describe one energy change that happens when you run.
问题：一块巧克力标签上写着含有 500 kJ 的能量。解释这些能量如何被你的肌肉细胞利用，并描述你跑步时发生的一种能量转换。
Food is broken down during digestion into small molecules such as glucose. Glucose is absorbed into the blood and transported to muscle cells. (Biology)
食物在消化过程中被分解成诸如葡萄糖这样的小分子。葡萄糖被吸收到血液中，并被运输到肌肉细胞。（生物）
Inside muscle cells, glucose reacts with oxygen during respiration. This chemical reaction releases energy that the cell can use. (Biology and Chemistry)
在肌肉细胞内，葡萄糖与氧气在呼吸作用中反应。这个化学反应释放出细胞可以利用的能量。（生物和化学）
When you run, chemical energy stored in glucose is changed into kinetic energy (movement) and thermal energy (heat). This is an energy transfer. (Physics)
当你跑步时，储存在葡萄糖中的化学能转化为动能（运动）和热能（热量）。这是一种能量转移。（物理）
4. Example 3: Materials and Their Properties | 示例三：材料及其性质
Question: Why are saucepan handles often made of plastic while the base is made of metal? Use ideas about particles and energy.
问题：为什么炖锅的把手通常用塑料制成，而锅底是金属做的？请运用关于粒子和能量的观点。
Metals are good conductors of heat because their particles are closely packed and have free electrons that can transfer energy quickly. When the base is heated, the metal particles vibrate more and pass the energy along. (Physics and Chemistry – material properties, particle model)
金属是热的良导体，因为它们的粒子紧密排列，并有自由电子可以快速传递能量。当锅底受热时，金属粒子振动加剧并将能量传递出去。（物理和化学——材料性质，粒子模型）
Plastic is a poor conductor (an insulator). Its particles do not pass on energy easily. This keeps the handle cool enough to hold. (Physics)
塑料是不良导体（绝缘体）。它的粒子不容易传递能量。这使得把手保持凉爽，可以手握。（物理）
The choice of materials depends on their thermal conductivity, which links physics (heat transfer) to chemistry (properties of substances).
材料的选择取决于它们的热导率，这连接了物理学（热传递）和化学（物质的性质）。
5. Example 4: Forces in Action | 示例四：力的作用
Question: When a fish swims, it pushes water backwards with its fins and tail. Explain why the fish moves forward. Name the two forces acting on the fish in the horizontal direction.
问题：当鱼游动时，它用鳍和尾巴向后推水。解释为什么鱼会向前移动。说出水平方向上作用在鱼身上的两个力。
This shows Newton’s third law of motion: for every action there is an equal and opposite reaction. The fish exerts a backward force on the water, so the water exerts an equal forward force on the fish. (Physics – forces and motion)
这显示了牛顿第三运动定律：每一个作用力都有一个大小相等、方向相反的反作用力。鱼对水施加一个向后的力，因此水对鱼施加一个相等的向前的力。（物理——力和运动）
The two horizontal forces are the forward push from the water (thrust) and the backward drag (water resistance or friction). When thrust is greater than drag, the fish accelerates. (Physics)
两个水平力是来自水向前的推力（推进力）和向后的阻力（水阻力或摩擦力）。当推力大于阻力时，鱼加速。（物理）
Living things have adapted shapes that reduce drag. Many fish have streamlined bodies, which reduces friction with water and saves energy. (Biology – adaptation linked to physics)
生物进化出了减小阻力的形状。许多鱼有流线型的身体，减少了与水的摩擦并节约能量。（生物——适应性与物理的联系）
6. Example 5: Acids and Alkalis in Daily Life | 示例五：生活中的酸与碱
Question: Lemon juice contains citric acid. Your stomach also produces hydrochloric acid. Explain why lemon juice tastes sour but does not burn your skin, while stomach acid can damage the stomach lining if it is not protected. Use the idea of pH.
问题：柠檬汁含有柠檬酸。你的胃也会产生盐酸。解释为什么柠檬汁尝起来酸但不会灼伤皮肤，而胃酸如果没有保护则会损伤胃黏膜。请运用 pH 的概念。
Acids have a pH lower than 7. The lower the pH, the stronger the acid. Lemon juice is a weak acid with a pH around 2-3. It contains only a low concentration of hydrogen ions (H⁺), so it can taste sour and act as a mild irritant but usually does not burn skin. (Chemistry)
酸的 pH 值低于 7。pH 值越低，酸性越强。柠檬汁是一种弱酸，pH 值约为 2-3。它只含有低浓度的氢离子（H⁺），所以尝起来酸并对皮肤有轻微刺激性，但通常不会灼伤皮肤。（化学）
Stomach acid is a strong acid (hydrochloric acid) with a pH around 1-2. It has a much higher concentration of hydrogen ions. The stomach lining is protected by a layer of mucus. If this mucus layer is damaged, the acid can attack the lining and cause an ulcer. (Biology and Chemistry)
胃酸是一种强酸（盐酸），pH 值大约为 1-2。它的氢离子浓度高得多。胃黏膜受到一层黏液保护。如果这层黏液受损，酸就会侵蚀胃壁并引起溃疡。（生物和化学）
7. Example 6: The Human Body and Physical Changes | 示例六：人体与物理变化
Question: When you breathe in, your chest volume increases. Explain how this causes air to enter the lungs. Refer to pressure and the particle model.
问题：当你吸气时，胸腔的容积增大。解释这如何使空气进入肺部。请提及压强和粒子模型。
Breathing in involves the contraction of the diaphragm and intercostal muscles, which increases the volume inside the chest. (Biology)
吸气涉及膈肌和肋间肌的收缩，这增大了胸腔内的容积。（生物）
According to the gas laws, when the volume of a container increases and the amount of gas stays the same, the pressure inside decreases. The pressure inside the lungs becomes lower than the atmospheric pressure outside. (Physics – pressure and volume)
根据气体定律，当容器的容积增大而气体量保持不变时，内部压强降低。肺内的压强低于外部大气压强。（物理——压强和体积）
Air particles move from an area of higher pressure (outside) to an area of lower pressure (inside the lungs) until the pressures equalise. This flow of air is inhalation. (Physics – particle movement)
空气粒子从高压区域（外部）移动到低压区域（肺内），直到压强平衡。这股空气流动就是吸气。（物理——粒子运动）
8. Example 7: Electricity and Its Sources | 示例七：电及其来源
Question: A battery makes a bulb light. Inside the battery, chemical reactions release electrons. What energy changes happen in the complete circuit? Describe one advantage and one disadvantage of using a rechargeable battery.
问题：电池使灯泡发光。在电池内部，化学反应释放电子。在整个电路中发生哪些能量转换？描述使用可充电电池的一个优点和一个缺点。
Inside the battery, chemical energy is changed into electrical energy. (Chemistry and Physics)
在电池内部，化学能转化为电能。（化学和物理）
In the wires and bulb, electrical energy is transferred. The bulb’s filament has high resistance, so electrical energy is changed into light and thermal energy. Overall: chemical → electrical → light + thermal. (Physics)
在导线和灯泡中，电能被转移。灯泡的灯丝具有高电阻，因此电能转化为光和热能。总体：化学能 → 电能 → 光能 + 热能。（物理）
A rechargeable battery can be used many times, which reduces waste and saves resources. However, making rechargeable batteries often requires metals like lithium, which can harm the environment if not disposed of properly. (Chemistry – materials, Environmental awareness)
可充电电池可以多次使用，减少了废物并节约了资源。然而，制造可充电电池通常需要锂等金属，如果处理不当会危害环境。（化学——材料，环保意识）
9. Tips for Answering Integrated Questions | 技巧：回答综合题的建议
Tip 1: Underline the key science words in the question. Words like ‘explain’, ‘compare’ or ‘describe’ tell you what to do. Also, circle the topics mentioned – e.g. particle, energy, cell – so you remember to include them.
技巧一：在题目中划出关键的科学词汇。诸如“解释”、“比较”或“描述”等词告诉你该做什么。同时，圈出所提及的主题——如粒子、能量、细胞——这样你会记得要包含它们。
Tip 2: Think of a ‘bridge’ between two areas. If a question mixes respiration and forces, the bridge is energy: respiration releases energy that muscles use to exert forces. Practise drawing concept maps linking topics.
技巧二：思考两个领域之间的“桥梁”。如果一道题混合了呼吸作用和力，桥梁就是能量：呼吸作用释放能量，肌肉利用能量来施加力。练习绘制连接不同主题的概念图。
Tip 3: Always use scientific vocabulary. Instead of ‘sugar burns in cells’, say ‘glucose is oxidised during aerobic respiration to release energy’. This shows you understand the process at a chemical and biological level.
技巧三：始终使用科学词汇。与其说“糖在细胞里燃烧”，不如说“葡萄糖在有氧呼吸中被氧化以释放能量”。这表明你理解了化学和生物层面的过程。
When a question asks for an ‘explanation’, use the structure: state the science rule, then apply it to the example. For instance: ‘Particles gain kinetic energy when heated. In boiling water, particles move fast enough to break free from the liquid, forming a gas.’
当题目要求“解释”时，使用这样的结构：陈述科学规律，然后将其应用于例子。例如：“粒子受热时获得动能。在沸水中，粒子移动得足够快，足以挣脱液体，形成气体。”
10. Practice Questions | 练习题
Try these mixed-topic questions. Write or think through your answers using the interdisciplinary approach.
尝试以下混合主题的题目。使用跨学科方法写下或思考出你的答案。
Q1: A puddle of water disappears faster on a sunny, windy day than on a calm, cool day. Use particle theory and energy ideas to explain why. (Physics and Chemistry)
问题1：一个水坑在晴朗有风的日子比在平静凉爽的日子消失得更快。利用粒子理论和能量观点解释原因。（物理和化学）
Q2: A plant makes glucose by photosynthesis using light energy. Later, a rabbit eats the plant and runs away. Describe the energy transfers from the Sun to the rabbit’s movement. (Biology and Physics)
问题2：植物利用光能通过光合作用制造葡萄糖。后来，一只兔子吃了这株植物并跑开了。描述从太阳到兔子运动的能量转移。（生物和物理）
Q3: A metal spoon left in a bowl of hot soup gets hot. The soup cools down. Explain this using the particle model and the concept of thermal equilibrium. (Physics – heat transfer)
问题3：一把留在热汤碗里的金属汤匙变热，而汤变凉。利用粒子模型和热平衡的概念解释。（物理——热传递）
Q4: Vinegar (acetic acid) reacts with baking soda to produce a gas that turns limewater cloudy. Name the gas and explain why this is a chemical change, referring to the formation of new substances. (Chemistry)
问题4：醋（乙酸）与小苏打反应产生一种气体，该气体使石灰水变浑浊。说出这种气体的名称，并解释为什么这是化学变化，提及新物质的生成。（化学）
For each question, try to identify the branches of science involved before you start writing. This habit will make the Cambridge Science exams much less scary.
对于每个问题，在你开始书写之前，试着辨别所涉及的科学分支。这个习惯会让剑桥科学考试变得不那么可怕。
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