📚 Year 7 Cambridge Economics: Mock Unit Test Analysis | Year 7 Cambridge 经济：单元测试模拟卷解析
This article provides a full walkthrough and detailed explanation of a typical Year 7 Cambridge Economics unit test. It covers fundamental concepts such as scarcity, choice, opportunity cost, factors of production, and basic market ideas. Use this revision guide to check your understanding, learn from common mistakes, and strengthen your knowledge for your next assessment.
本文为一份典型的 Year 7 剑桥经济单元测试提供完整的讲解与详细解析。内容涵盖稀缺性、选择、机会成本、生产要素以及基本市场概念等核心知识。你可以利用这份复习指南检查自己的掌握情况，从常见错误中学习，并为下一次评估巩固所学内容。
1. Question 1: The Basic Economic Problem | 第1题：基本经济问题
The question asks: ‘What is the fundamental economic problem faced by all societies?’ The correct answer is scarcity – the situation in which human wants are unlimited, but the resources available to satisfy those wants are limited. This tension forces individuals and governments to make choices about how to allocate resources efficiently. Without scarcity, there would be no need for economics.
这道题问的是：“所有社会都面临的基本经济问题是什么？” 正确答案是稀缺性——即人类的欲望是无限的，但用来满足这些欲望的资源却是有限的。这种矛盾迫使个人和政府必须做出选择，以有效分配资源。如果没有稀缺性，经济学就没有存在的必要了。
2. Question 2: Needs versus Wants | 第2题：需要与想要
Students were asked to identify which item from a list is a need rather than a want. A need is something essential for survival, such as clean water, food, shelter, and basic clothing. In contrast, a want is a desire that makes life more comfortable but is not essential, like a smartphone or a cinema ticket. The correct choice in this test was ‘nutritious food’, as it is vital for physical health. Understanding this distinction helps explain why people prioritise spending even when money is limited.
学生需要从列表中找出哪一项是需要而非想要。需要是维持生存所必需的东西，例如干净的水、食物、住所和基本衣物。想要则是让生活更舒适但非必需的欲望，比如智能手机或电影票。本测试中正确选项是“营养食物”，因为它是身体健康的关键。理解这一区别有助于解释为什么人们在金钱有限时仍然会优先安排某些支出。
3. Question 3: Opportunity Cost | 第3题：机会成本
This item presented a scenario: ‘Sara has £15. She can either buy a book or go to the cinema. If she chooses the book, what is her opportunity cost?’ The correct answer is the enjoyment of the cinema that she gives up. Opportunity cost is defined as the next best alternative forgone when a choice is made. It is not the amount of money spent, but the value of the lost alternative. Always remember that every decision has a cost, even if no money changes hands.
题目给出了一个情景：“萨拉有15英镑，她可以买一本书或去看电影。如果她选择了书，那么她的机会成本是什么？” 正确答案是她放弃的电影体验。机会成本的定义是做出选择时所放弃的次优替代选项。它不是花费的金钱数额，而是失去的那个替代选项的价值。请务必记住，每个决定都有成本，即使没有发生金钱交易。
4. Question 4: Goods and Services | 第4题：商品与服务
The test asked learners to classify items as either goods or services. Goods are tangible products that can be seen and touched, such as a bicycle, a chocolate bar, or a textbook. Services are intangible actions performed by someone for another person, such as a haircut, a bus ride, or online tutoring. A common mistake is treating something like a streaming platform as a pure good, when the platform is actually a service providing access to content. Remember: if you can physically hold it, it is a good; if it is an experience or activity, it is a service.
该题要求学生将物品分类为商品或服务。商品是有形的、可以看得见摸得着的产品，例如自行车、巧克力棒或课本。服务是由他人为另一个人执行的无形行为，例如理发、乘坐公交车或在线辅导。一个常见错误是把流媒体平台当作单纯的商品，而实际上该平台是提供内容访问的服务。记住：如果你能实实在在地拿在手里，它就是商品；如果是一种体验或活动，它就是服务。
5. Question 5: Factors of Production | 第5题：生产要素
This section covered the four factors of production: land, labour, capital, and enterprise. Land includes all natural resources such as soil, water, oil, and fish stocks. Labour is the human effort used in production, both physical and mental. Capital refers to man-made tools and equipment that help produce other goods, like machinery or school buildings. Enterprise is the skill of combining the other three factors and taking the risk to start a business. The correct matching exercise required linking ‘teacher’ to labour, ‘forest’ to land, ‘tractor’ to capital, and ‘entrepreneur’ to enterprise.
该部分涉及四种生产要素：土地、劳动力、资本和企业精神。土地包括所有自然资源，如土壤、水、石油和鱼类资源。劳动力是用于生产的人类努力，包括体力和脑力劳动。资本指用于帮助生产其他产品的人造工具和设备，如机器或教学楼。企业精神则是指组合其他三种要素、承担风险去创业的技能。正确的配对练习要求将“教师”与“劳动力”连接，“森林”与“土地”，“拖拉机”与“资本”，“企业家”与“企业精神”。
6. Question 6: Producers and Consumers | 第6题：生产者与消费者
Students had to distinguish between a producer and a consumer. A producer is someone who makes or sells goods and services. A consumer is someone who purchases and uses them. The same person can be both: a farmer who grows vegetables (producer) and also buys a mobile phone (consumer). The mock test asked, ‘A baker who sells bread is a _________.’ The answer is producer. A follow-up true-or-false statement was: ‘All consumers are producers.’ This is false, because a young child who receives pocket money and buys sweets is a consumer but does not necessarily produce anything.
学生需要区分生产者与消费者。生产者是制造或销售商品与服务的人，消费者是购买并使用它们的人。同一个人可以同时扮演两种角色：一位种植蔬菜的农民是生产者，但他购买手机时又是消费者。模拟卷中有一题问：“卖面包的面包师是______。”答案是生产者。随后又有一道判断题：“所有消费者都是生产者。”这是错误的，因为一个拿着零花钱买糖果的儿童是消费者，但并不一定生产任何东西。
7. Question 7: The Law of Demand | 第7题：需求定律
This question tested the relationship between price and quantity demanded. According to the law of demand, when the price of a good rises, the quantity demanded usually falls, and when the price falls, the quantity demanded usually rises – assuming all other factors stay the same (ceteris paribus). A typical question provides a data table: ‘At £1 per ice cream, 50 units are demanded; at £3 per ice cream, only 20 units are demanded.’ The student must explain that the higher price reduces consumers’ willingness and ability to buy. This inverse relationship can be shown as:
该题考察价格与需求量之间的关系。根据需求定律，当一种商品的价格上升时，需求量通常会下降；当价格下降时，需求量通常会上升——假设其他条件保持不变（ceteris paribus）。常见的题目会给出数据表：“冰淇淋每份1英镑时，需求量为50份；每份3英镑时，需求量仅为20份。”学生需要解释高价降低了消费者的购买意愿和能力。这种反比关系可表示为：
Price ↑ → Quantity Demanded ↓
The English explanation highlights the cause-and-effect arrow; Chinese students should remember that it is not just about willingness – ability to pay also matters when price rises.
英文解释中强调了因果箭头；中国学生应记住，当价格上升时，不仅购买意愿下降，支付能力也同样受影响。
8. Question 8: Supply and Equilibrium | 第8题：供给与均衡
Supply analysis often confuses Year 7 learners. The law of supply states that as price increases, the quantity supplied typically increases – because producers are more willing to provide goods when they can earn higher revenue. A second part of the question introduced a simple market equilibrium: ‘If a new technology makes it cheaper to produce pens, what will happen to the supply curve?’ The correct answer is that supply will shift to the right, leading to a lower equilibrium price and higher quantity. The key is to treat price as a signal: when costs fall, producers can offer more at every price point.
供给分析常常让七年级学生感到困惑。供给定律指出，随着价格上升，供给量通常也会增加——因为当生产者能获得更高收入时，他们更愿意提供商品。该题第二部分引入了简单的市场均衡概念：“如果新技术使生产钢笔的成本降低，供给曲线将如何变化？”正确答案是供给将向右移动，导致均衡价格下降、均衡数量上升。关键在于将价格视为信号：当成本下降时，生产者在每个价位上都愿意提供更多的数量。
Technology improves → Supply increases → Equilibrium Price ↓, Quantity ↑
This chain of logic is essential for achieving full marks; simply writing ‘supply goes up’ is not enough without explaining the consequences.
这一逻辑链条对于获得满分至关重要；只写“供给增加”而没有解释其后果是不够的。
9. Question 9: Functions of Money | 第9题：货币的功能
The test asked, ‘Which of the following is a main function of money? A) Medium of exchange, B) Source of happiness, C) A scarce metal.’ The correct function is a medium of exchange – money allows people to trade goods and services without needing a barter system. It also serves as a unit of account (measuring value in prices) and a store of value (saving purchasing power for the future). Students should remember that money does not have to be physical coins; digital payments still perform these functions. The incorrect option ‘source of happiness’ reminds us that money is a tool, not an end in itself.
题目问道：“以下哪项是货币的主要功能？A) 交换媒介，B) 幸福感的来源，C) 一种稀缺金属。”正确的功能是交换媒介——货币使人们无需以物易物就可以交换商品和服务。它同时还承担着计价单位（用价格衡量价值）和价值储藏（为未来保存购买力）的功能。学生应当记住，货币不一定是实物硬币；数字支付同样能实现这些功能。错误选项“幸福感的来源”提醒我们，货币是一种工具，而非目的本身。
10. Question 10: Markets and Specialisation | 第10题：市场与专业化
The final question connected markets with the concept of specialisation. A market is any arrangement that brings buyers and sellers together – it can be a physical place like a fruit market, or an online platform. Specialisation occurs when people, businesses, or countries focus on producing a limited range of goods or services in which they have an advantage. The test required students to explain why specialisation can increase output: by concentrating on one task, workers become more skilled and productive, which can lower costs. Markets are necessary to trade the surpluses created by specialisation. Without exchange, a specialist baker would have only bread and no clothes!
最后一题将市场与专业化的概念联系起来。市场是任何将买卖双方聚集在一起的安排——它可以是像水果市场这样的实体场所，也可以是一个在线平台。专业化是指个人、企业或国家专注于生产自己具有优势的有限范围的商品或服务。该题要求学生解释为何专业化能提高产量：通过专注于一项任务，工人变得更加熟练和高产，从而可以降低成本。市场则是交换专业化所创造的剩余产品的必要场所。没有交换，一位专业的面包师只能拥有面包，却没有衣服！
11. Overall Test Strategy: Tackling Definitions and Data | 第11题：整体应试策略：攻克定义与数据
Beyond individual questions, this mock test rewards precise use of economic vocabulary. When defining terms like ‘scarcity’ or ‘opportunity cost’, always give a full sentence rather than a keyword. For example, write ‘Scarcity means that resources are limited while wants are infinite,’ not just ‘scarcity = limited.’ When a question includes a table or a graph, spend 20 seconds scanning the axes and the trend before answering. Check whether the data shows a positive or negative relationship. Small mistakes like misreading the unit (quantity in hundreds, not single items) can cost marks.
除了单个题目，这份模拟卷看重对经济术语的准确使用。在给“稀缺性”或“机会成本”下定义时，始终要写出完整的句子，而不是只给关键词。例如，写“稀缺性意味着资源有限而欲望无限”，而不是仅仅写“稀缺=有限”。当题目包含表格或图表时，花20秒浏览坐标轴和趋势，然后再作答。确认数据呈现的是正相关还是负相关。像误读单位（数量以百为单位，而非单个物品）这样的小错误都可能导致丢分。
12. Common Pitfalls and How to Avoid Them | 第12题：常见陷阱与规避方法
Year 7 students often lose marks by rushing to conclusions without linking their answers to economic principles. One typical error is confusing a change in demand (shift of the entire curve) with a change in quantity demanded (movement along the curve). Another is forgetting the ‘ceteris paribus’ assumption when analysing cause and effect. A third pitfall is using vague language – replace ‘a lot of people buy’ with ‘the quantity demanded increases’. A final piece of advice: always read the command word carefully. ‘Explain’ requires a reason, while ‘identify’ simply asks for a name or term.
七年级学生常因急于下结论、未将答案与经济原理联系起来而丢分。一个典型错误是混淆了需求的变动（整条曲线移动）与需求量的变动（沿曲线移动）。另一个问题是分析因果关系时忘记“其他条件不变”的假设。第三个陷阱是使用模糊的语言——将“很多人购买”替换为“需求量增加”。最后一条建议：一定要仔细阅读指令词。“解释”要求给出理由，而“识别”只要求给出名称或术语。
Published by TutorHao | Economics Revision Series | aleveler.com
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