📚 Year 7 CCEA Biology: Summer Bridging and Preparation Course | 七年级CCEA生物：暑期预习与衔接课程
Moving from primary science to secondary biology is an exciting step. This summer bridging course is designed to help Year 7 students consolidate their knowledge of living things and build confidence for the skills they will need in the CCEA curriculum. We will explore what makes something alive, zoom into cells, discover the variety of life, and link key ideas about the human body, plants and ecosystems. Each topic revisits ideas you may have met in primary school and adds new layers of understanding, so you feel ready to think like a biologist from the very first lesson.
从小学的科学课过渡到中学的生物课是一个令人兴奋的进步。这套暑期衔接课程旨在帮助七年级学生巩固关于生物的知识，并为 CCEA 课程所需的能力建立信心。我们将探索什么是“活着”的标准，放大到细胞层面，发现生命的多样性，并串联起关于人体、植物和生态系统的关键概念。每个主题都会回顾你在小学接触过的内容，并增添新的理解层次，让你从第一堂课起就能用生物学家的方式思考。
1. What is Biology? | 什么是生物学？
Biology is the branch of science that studies living organisms and how they interact with their environment. In primary school you may have called this part of science ‘Living Things and Their Habitats’ or simply ‘Nature Study’. Now we give it a formal name and begin to ask deeper questions: How do organisms survive? Why do they look the way they do? How are they connected?
生物学是研究生物体及其如何与环境相互作用的科学分支。在小学，你可能把这一部分科学称为“生物及其栖息地”或者简单的“自然观察”。现在我们给它一个正式的名称，并开始提出更深层次的问题：生物体如何生存？它们为什么长成那个样子？它们之间又有怎样的联系？
Biologists use observation, experimentation and classification to build our understanding. As you enter Year 7, you will learn to use a microscope, draw accurate labelled diagrams, and write conclusions based on evidence. These are the same tools scientists use every day. Seeing the subject as a real science helps you take ownership of your learning.
生物学家通过观察、实验和分类来构建我们的认识。进入七年级后，你将学习使用显微镜，画出准确的有标注的示意图，并根据证据撰写结论。这些就是科学家们每天使用的工具。把这门学科当作真正的科学来看待，能帮助你对学习产生主人翁意识。
2. The Characteristics of Living Things | 生物的特征
To study biology, we must first agree on what it means to be alive. Biologists use a memorable checklist often taught as ‘MRS GREN’. Each letter stands for a life process: Movement, Respiration, Sensitivity, Growth, Reproduction, Excretion and Nutrition. All living things carry out these processes, even if they do them in very different ways.
要学习生物学，我们首先得明确“活着”意味着什么。生物学家使用一个容易记住的清单，常被教授为“MRS GREN”。每个字母代表一种生命活动：运动、呼吸作用、感应、生长、繁殖、排泄和营养。所有生物都进行这些活动，尽管它们的方式可能大不相同。
Movement: Animals move their whole bodies to find food or escape danger; plants move parts, such as leaves turning towards light. 中文： 运动：动物移动整个身体来寻找食物或逃避危险；植物移动部分身体，例如叶片朝向阳光转动。
Respiration: This is a chemical reaction inside cells that releases energy from food. It is not the same as breathing in and out. 中文： 呼吸作用：这是发生在细胞内部的化学反应，从食物中释放能量。它不同于吸气和呼气。
Sensitivity: Organisms detect and respond to changes in their surroundings. A plant bending towards light is showing sensitivity. 中文： 感应：生物能察觉并响应周围环境的变化。一株植物向光弯曲就是在表现感应性。
Growth: Living things grow by increasing cell number and size. This is a permanent increase, not a temporary swelling after a meal. 中文： 生长：生物体通过增加细胞数量和大小来生长。这是一种永久性的增大，并非饭后暂时的膨胀。
Reproduction: The ability to produce offspring. This can be sexual, needing two parents, or asexual, needing only one. 中文： 繁殖：产生后代的能力。可以是有性生殖，需要两个亲本；或是无性生殖，只需一个亲本。
Excretion: The removal of toxic waste products made by chemical reactions in the body. In humans this includes urea in urine and carbon dioxide in breath. 中文： 排泄：清除体内化学反应产生的有毒废物。在人体中，这包括尿液里的尿素和呼出气体中的二氧化碳。
Nutrition: Taking in materials for energy, growth and repair. Plants make their own food by photosynthesis; animals eat other organisms. 中文： 营养：摄取物质以获得能量、生长和修复。植物通过光合作用制造自己的食物；动物则以其他生物为食。
3. Cells: The Building Blocks of Life | 细胞：生命的基石
All living things are made of tiny units called cells. Some organisms, like bacteria and amoeba, are unicellular – made of one cell. Most plants and animals are multicellular, with bodies built from millions of cells that work together. A cell is the smallest unit that can carry out all MRS GREN processes.
所有生物都由叫做细胞的微小单位构成。有些生物，比如细菌和变形虫，是单细胞的——只由一个细胞构成。大多数植物和动物是多细胞的，它们的身体由数以百万计协同工作的细胞组成。细胞是能够进行所有“MRS GREN”生命活动的最小单位。
An animal cell typically has three main parts: a cell membrane that controls what enters and leaves, a nucleus that contains genetic material and controls the cell’s activities, and cytoplasm where most chemical reactions happen. Plant cells have all of these plus a rigid cell wall for support, chloroplasts that capture light energy for photosynthesis, and a large central vacuole containing cell sap.
动物细胞通常有三个主要部分：控制物质进出的细胞膜，含有遗传物质并控制细胞活动的细胞核，以及发生大多数化学反应的细胞质。植物细胞除了这三样之外，还有提供支持作用的坚硬的细胞壁，捕捉光能进行光合作用的叶绿体，以及充满细胞液的大中央液泡。
When you start Year 7, you will learn to use a light microscope to view cells. You will practise preparing a slide of onion epidermis or cheek cells, adding a drop of iodine or methylene blue to stain the structures, and then drawing what you see, labelling the parts clearly.
当你开始七年级的学习，你将学习使用光学显微镜观察细胞。你会练习制作洋葱表皮或口腔上皮细胞的装片，滴加一滴碘液或亚甲基蓝来染色结构，然后画出你所观察到的图像，并清楚地标注各部分。
4. Microorganisms: Friends and Foes | 微生物：朋友还是敌人？
Microorganisms, or microbes, are living things too small to see with the naked eye. They include bacteria, fungi and viruses, although viruses are often debated because they cannot carry out all life processes on their own. In this bridging course, we start to sort the helpful microbes from the harmful ones.
微生物，或称微生物体，是小到肉眼无法看见的生物。它们包括细菌、真菌和病毒，尽管病毒常被争论因为它们无法独立完成所有的生命活动。在这门衔接课程中，我们开始区分有益的微生物和有害的微生物。
Helpful bacteria are used to make yoghurt and cheese, and many live in our gut helping us digest food. Decomposer fungi and bacteria break down dead material, recycling nutrients back into the soil. However, harmful microbes can cause diseases such as sore throats, food poisoning or athlete’s foot. Good hygiene, refrigeration and cooking food thoroughly all limit the spread of harmful microbes.
有益的细菌被用来制作酸奶和奶酪，许多细菌生活在我们的肠道里帮助我们消化食物。分解者的真菌和细菌分解死去的生物体，将营养物质循环回土壤中。然而，有害的微生物能引起疾病，如喉咙痛、食物中毒或脚癣。良好的卫生习惯、冷藏和彻底煮熟食物都可以限制有害微生物的传播。
An exciting experiment you might try is growing microbes on agar plates. By swabbing a surface before and after cleaning, you see just how important washing hands can be. This links everyday actions to scientific evidence.
一个你可能尝试的有趣实验是在琼脂平板上培养微生物。通过擦拭清洁前后的表面，你就能亲眼看到洗手有多么重要。这会把日常行为与科学证据联系起来。
5. The Variety of Life: Classification | 生物多样性：分类
With millions of species on Earth, biologists need a system to organise them. Classification sorts living things into groups based on similarities and evolutionary relationships. In primary school you may have grouped animals into vertebrates and invertebrates. Now we expand this into larger categories called kingdoms.
地球上有数百万个物种，生物学家需要一个系统来将它们组织起来。分类系统根据相似性和进化关系把生物分成不同的群体。在小学，你可能把动物分成了脊椎动物和无脊椎动物。现在我们将其扩展为更大的类别，称为“界”。
The five‑kingdom system commonly used includes: Animals, Plants, Fungi, Protoctists (mostly single‑celled organisms like amoeba) and Prokaryotes (bacteria, which have no true nucleus). Within the animal kingdom, vertebrates are further divided into five classes: fish, amphibians, reptiles, birds and mammals. Each class has key features, such as moist skin in amphibians or feathers in birds.
常用的五界系统包括：动物界、植物界、真菌界、原生生物界（多为单细胞生物，如变形虫）和原核生物界（没有真正细胞核的细菌）。在动物界中，脊椎动物进一步分为五个纲：鱼类、两栖类、爬行类、鸟类和哺乳类。每个纲都有标志性特征，例如两栖动物湿润的皮肤或鸟类的羽毛。
Learning to use a simple classification key is a core skill. You will be given a set of organisms and asked to identify them by asking a series of yes/no questions, such as ‘Does it have wings?’ or ‘Does it have a backbone?’. This logical approach mirrors how scientists sort biodiversity.
学会使用简单的分类检索表是一项核心技能。你会拿到一组生物，然后通过问一系列“是/否”的问题来鉴别它们，例如“它有翅膀吗？”或“它有脊椎吗？”。这种逻辑方法与科学家整理生物多样性的方式如出一辙。
6. Plants and Photosynthesis | 植物与光合作用
Plants are special because they can make their own food using light energy. This process is called photosynthesis, and it takes place mainly in the leaves inside tiny structures called chloroplasts. The overall word equation for photosynthesis is: carbon dioxide + water → glucose + oxygen, in the presence of light energy absorbed by chlorophyll.
植物很特别，因为它们能利用光能制造自己的食物。这个过程叫做光合作用，主要发生在叶片里叫做叶绿体的微小结构中。光合作用的总文字方程式是：二氧化碳 + 水 → 葡萄糖 + 氧气，需要叶绿素吸收的光能。
6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂
Glucose is used by the plant for respiration to release energy, stored as starch, or converted into cellulose for cell walls and into proteins for growth. Oxygen is released into the air as a waste product, which is vital for animals. This single reaction connects plants to all other life.
葡萄糖被植物用于呼吸作用释放能量，以淀粉的形式储存，或者转化为构成细胞壁的纤维素以及促进生长的蛋白质。氧气作为副产品释放到空气中，这对动物至关重要。单单这个反应就把植物和所有其他生命联系了起来。
You can investigate photosynthesis by testing a leaf for starch. Boiling the leaf in water, then heating it in ethanol to remove chlorophyll, and finally adding iodine solution will turn the leaf blue‑black if starch is present. This shows that photosynthesis has occurred.
你可以通过测试叶片中的淀粉来探究光合作用。将叶片在沸水中煮软，然后在乙醇中加热脱去叶绿素，最后滴加碘液，如果存在淀粉，叶片就会变成蓝黑色。这就表明光合作用确实发生了。
7. The Human Body: Organs and Systems | 人体：器官与系统
In Year 7 you begin to see the human body as a collection of interacting systems. An organ is a structure made of different tissues that performs a specific job; a system is a group of organs working together, such as the digestive system, the respiratory system and the circulatory system.
在七年级，你开始把人看成一个由相互作用的系统组成的集合。器官是由不同组织构成的、执行特定功能的结构；系统则是一组协同工作的器官，比如消化系统、呼吸系统和循环系统。
The circulatory system, with the heart as its pump, transports blood containing oxygen, nutrients and waste products around the body. The respiratory system brings oxygen into the lungs and removes carbon dioxide. The digestive system breaks down large food molecules into small, soluble ones that can be absorbed into the blood. These systems do not work in isolation – they are linked.
循环系统以心脏为泵，将携带氧气、营养物质和废物的血液运送到全身。呼吸系统将氧气带入肺部并排出二氧化碳。消化系统将大分子食物分解成可吸收的小分子可溶物质，并吸收进入血液。这些系统并不是孤立工作的——它们是相互联系的。
A fun activity is to draw a life‑sized outline of a classmate and place organ cut‑outs in the correct positions. This helps you learn locations such as the heart slightly left of centre, the stomach below the diaphragm, and the kidneys near the back. Knowing where organs sit makes later learning about their functions much clearer.
一项有趣的活动是描摹一位同学的身体轮廓，并将器官剪贴画放在正确的位置上。这能帮助你记住器官的部位，比如心脏略偏左，胃在横膈膜下方，肾脏靠近后背。知道了器官的位置，今后学习它们的功能就会清晰得多。
8. Healthy Eating and Digestion | 健康饮食与消化
Good health depends on a balanced diet that provides all the necessary nutrients. The seven groups are: carbohydrates (for energy), proteins (for growth and repair), lipids or fats (for energy storage and insulation), vitamins and minerals (to keep various body processes healthy), fibre (to keep the gut moving) and water (for chemical reactions and transport).
良好的健康依赖于提供所有必要营养素的均衡饮食。七大营养类别是：碳水化合物（提供能量）、蛋白质（用于生长和修复）、脂类或脂肪（用于储存能量和隔热）、维生素和矿物质（维持各项身体过程健康）、纤维（保持肠道蠕动）和水（用于化学反应和运输）。
Digestion begins in the mouth, where teeth break food into smaller pieces and saliva starts to digest starch. The food then travels down the oesophagus to the stomach, where acid and enzymes break down proteins. In the small intestine, digested food is absorbed into the blood; the large intestine absorbs extra water and forms faeces. Understanding this journey shows why eating whole foods and chewing well matters.
消化从口腔开始，牙齿将食物破碎成小块，唾液开始消化淀粉。食物随后经食管进入胃，胃里的酸和酶分解蛋白质。在小肠中，消化后的食物被吸收进血液；大肠则吸收多余的水分并形成粪便。理解了这一旅程，就知道为什么吃天然食物和充分咀嚼很重要。
CCEA investigations often ask you to test foods for starch (iodine turns blue‑black), glucose (Benedict’s solution turns brick‑red on heating) or protein (biuret reagent turns purple). These practical skills reinforce the idea that biology is based on observable evidence.
CCEA 的调查题常要求你检测食物中的淀粉（碘液变蓝黑色）、葡萄糖（本尼迪克特试剂加热后变砖红色）或蛋白质（双缩脲试剂变成紫色）。这些动手技能强化了生物学基于可观察证据的理念。
9. Ecosystems and Food Chains | 生态系统与食物链
An ecosystem includes all the organisms in a habitat plus the physical environment they interact with. Individual organisms form populations, populations of different species form communities, and the community together with non‑living factors like sunlight, water and soil makes an ecosystem.
生态系统包括某个栖息地中的所有生物体以及它们与之相互作用的物理环境。各个生物体组成种群，不同物种的种群组成群落，而群落连同阳光、水和土壤等非生物因素共同构成一个生态系统。
Feeding relationships are shown by food chains. A simple chain goes: grass → rabbit → fox. The arrow always points from the eaten to the eater and means ‘is eaten by’. The grass is a producer, the rabbit a primary consumer (herbivore) and the fox a secondary consumer (carnivore). In reality, food webs are much more tangled, with many interconnected chains.
取食关系用食物链来表示。一条简单的链是：草 → 兔 → 狐狸。箭头始终从被吃者指向吃者，表示“被……吃”。草是生产者，兔是初级消费者（草食动物），狐狸是次级消费者（肉食动物）。现实中，食物网更加复杂，许多链交织在一起。
Energy passes along the chain, but much is lost at each level as heat through respiration. This limits the length of food chains. Decomposers such as bacteria and fungi are essential because they break down dead matter and waste, returning minerals to the soil for plants to use again.
能量沿着食物链传递，但每一级都有大量能量通过呼吸作用以热的形式散失。这限制了食物链的长度。分解者，如细菌和真菌，至关重要，因为它们分解死去的物质和废物，把矿物质归还土壤，供植物重新利用。
10. Scientific Enquiry Skills | 科学探究技能
Moving into secondary biology means doing more than remembering facts; you must learn to work scientifically. CCEA expects you to plan investigations, identify variables, collect reliable data and draw conclusions. The three main variable types are: independent (the one you change), dependent (the one you measure) and control variables (all the things you must keep the same to make a fair test).
进入中学阶段的生物学意味着你不仅要记住事实，还必须学会科学地开展工作。CCEA 期望你能设计探究、识别变量、收集可靠的数据并得出结论。三种主要的变量类型是：自变量（你改变的那个）、因变量（你测量的那个）和控制变量（为确保公平测试而必须保持不变的所有因素）。
Writing a hypothesis is a skill you will develop. A hypothesis is not just a guess – it is a clear, testable statement such as ‘If more light is available, then the pondweed will produce more oxygen bubbles per minute.’ You then design a method to test this prediction, using equipment safely and accurately.
写假设是一项你将不断培养的技能。假设不仅仅是一个猜测——它是一个清晰、可验证的陈述，例如“如果光照更充足，那么水草每分钟产生的氧气气泡就越多。”然后你需要设计一个方法来检验这个预测，并安全、准确地使用设备。
Recording data in a table with clear headings and units, plotting a graph, and then describing the pattern are routine tasks. You will also learn to evaluate your experiment by discussing limitations and suggesting improvements. These skills make you a critical thinker, not just a scientist.
将数据记录在带有清晰标题和单位的表格中，绘制图表，然后描述规律，这些都会成为常规任务。你还会学习通过讨论局限性和提出改进建议来评估自己的实验。这些技能会让你成为一个批判性思考者，而不仅仅是科学家。
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