📚 Year 7 WJEC Economics: Unit Test Mock Paper Walkthrough | 七年级WJEC经济：单元测试模拟卷解析
This walkthrough breaks down a typical Year 7 WJEC Economics unit test, giving you the tools to tackle both multiple-choice and short-answer questions. We will explore the key economic ideas behind each question, from scarcity to opportunity cost, so you can understand exactly what examiners are looking for and how to write top-mark answers.
本文详细拆解一份典型的七年级WJEC经济单元测试模拟卷，为你提供应对选择题和简答题的工具。我们将逐一探讨每道题背后的关键经济概念——从稀缺性到机会成本——让你准确理解考官的意图，学会如何写出高分答案。
1. Understanding the Exam Structure | 了解考试结构
A Year 7 WJEC Economics unit test usually has two sections. Section A contains multiple-choice questions that test your knowledge of basic definitions and concepts. Section B asks you to write short answers or to interpret simple data, such as a demand schedule. You will have about 45 minutes to complete the paper, so time management is important.
七年级WJEC经济单元测试通常分为两个部分。A部分为选择题，考查你对基本定义和概念的掌握。B部分要求写简答题或解读简单数据，比如需求表。考试时间大约45分钟，因此时间管理非常重要。
In our mock paper, Section A includes five one-mark multiple-choice questions, and Section B has two structured questions worth 4 marks each. This structure mirrors what you are likely to see in your real test. Practising with a mock paper helps you become familiar with the command words used, such as ‘identify’, ‘explain’ and ‘calculate’.
在我们的模拟卷中，A部分包含五道1分选择题，B部分有两道4分的结构化题目。这种结构与你的真实考试十分相似。通过模拟卷练习，你可以熟悉“指出”、“解释”和“计算”等指令词，从而在考场上更加从容。
2. Scarcity – The Heart of Economics | 稀缺性——经济学的核心
Question 1 in the mock paper asks: ‘What is the basic economic problem?’ The correct answer is ‘Unlimited wants and limited resources.’ This is the definition of scarcity. Scarcity exists because people have infinite desires, but the world has a finite amount of resources such as land, labour and raw materials.
模拟卷第1题问道：“基本经济问题是什么？”正确答案是“无限的欲望与有限的资源”。这正是稀缺性的定义。稀缺之所以存在，是因为人们的欲望无穷无尽，而世界的资源——如土地、劳动力和原材料——却是有限的。
Because of scarcity, we must make choices. An economy cannot produce everything everyone wants. Economics is essentially the study of how people, businesses and governments make those choices. When you see a question about the ‘basic economic problem’, always think of the gap between wants and available resources.
由于稀缺性的存在，我们必须做出选择。一个经济体无法生产出所有人想要的一切。经济学本质上是研究个人、企业和政府如何做出这些选择的学科。当你看到有关“基本经济问题”的题目时，一定要联想到欲望与可用资源之间的差距。
3. Needs vs. Wants in Exam Questions | 考试中的需求与欲望
Mock Question 2 asks: ‘Which of the following is a need?’ The options are a video game, clean water and a cinema ticket. The correct answer is clean water. A need is something essential for survival, such as water, food, shelter and basic clothing. Wants are things we would like to have but are not necessary for staying alive, such as entertainment or luxury items.
模拟卷第2题问道：“以下哪一项是需要？”选项分别是电子游戏、洁净水和电影票。正确答案是洁净水。需要是维持生存所必需的东西，例如水、食物、住所和基本衣物。欲望则是我们想要但并非生存必需的物品，比如娱乐或奢侈品。
WJEC examiners may try to confuse you with items that feel important but are actually wants. A smartphone might seem essential today, but it is still classified as a want because you can survive without it. Always ask yourself: ‘Can a person live without this?’ If the answer is yes, it is a want, not a need.
WJEC考官可能会用看似重要但实为欲望的物品迷惑你。智能手机在当下或许感觉不可或缺，但它仍被归类为欲望，因为离开它你依然能生存。答题时一定要问自己：“一个人没有这个东西能活下去吗？”如果答案是肯定的，那它就是欲望，而非需要。
4. Goods and Services: How to Identify Them | 商品与服务：如何识别
Question 3 presents: ‘A haircut is an example of a…’ The correct choice is ‘Service’. Goods are physical, tangible items you can touch and own, like a pencil or a pair of shoes. Services are intangible activities done for you by someone else, such as a haircut, a bus journey or a music lesson.
模拟卷第3题给出：“理发是哪一项的例子？”正确答案是“服务”。商品是你可以触碰并拥有的有形物品，比如一支铅笔或一双鞋。服务则是他人为你完成的无形活动，例如理发、乘坐公交车或上音乐课。
In an exam, look for key words like ‘experience’, ‘activity’ or ‘done for you’ to spot a service. Remember that some things involve both a good and a service. For example, a restaurant meal includes the food (goods) and the waiter taking your order (service). If the question asks what a haircut is, you only need to say ‘service’.
在考试中，可以通过“体验”、“活动”或“为你所做的”等关键词来识别服务。要记住，有些事物同时包含商品和服务。例如，一顿餐厅饭菜既包括食物（商品），也包括服务员为你点单（服务）。如果题目问理发属于什么，你只需回答“服务”即可。
5. Factors of Production: Remember CELL | 生产要素：记住CELL
Mock Question 4 asks: ‘The four factors of production are land, labour, capital and…’ The missing factor is enterprise. The four inputs used to make goods and services are often remembered by the acronym CELL: Capital, Enterprise, Land and Labour. Land covers all natural resources, labour is human effort, capital is man-made tools and machinery, and enterprise is the skill of bringing the other three factors together to start a business.
模拟卷第4题问道：“四种生产要素是土地、劳动力、资本和……”所缺的生产要素是企业家精神。用于生产商品与服务的四种投入通常可以用首字母缩写CELL来记忆：资本(Capital)、企业家精神(Enterprise)、土地(Land)和劳动力(Labour)。土地涵盖所有自然资源，劳动力是人类付出的努力，资本是人造工具和机器，而企业家精神则是整合其他三种要素去创业的技能。
A common trap is to choose ‘money’ as a factor of production. Money itself is not a productive resource; it is a medium of exchange that allows businesses to buy land, labour or capital. Exam questions will expect you to distinguish between the real resources and the financial resources used to acquire them.
一个常见的误区是选择“金钱”作为生产要素。金钱本身并非生产性资源；它是一种交换媒介，让企业能够购买土地、劳动力或资本。考题希望你能区分实际资源与用于获取这些资源的财务资源。
6. Opportunity Cost: The Next Best Alternative | 机会成本：次优选择
Question 5 states: ‘The next best alternative forgone is called…’ The correct answer is opportunity cost. Whenever you make a choice, the opportunity cost is the value of the next best option you give up. It is a crucial concept because scarcity forces us to make choices, and every choice involves a trade-off.
模拟卷第5题指出：“被放弃的次优替代选择叫做……”正确答案是机会成本。每当你做出一个选择，机会成本就是你所放弃的次优选项的价值。这是一个关键概念，因为稀缺性迫使我们做出选择，而每一个选择都包含着权衡。
In Section B of the mock paper, a short-answer question asks: ‘Explain how a student might face an opportunity cost when deciding how to spend £10.’ (4 marks) A strong answer identifies two clear alternatives and states the opportunity cost. For example: ‘The student can either buy a new book for £10 or go to the cinema. If she chooses the book, the opportunity cost is the enjoyment she would have gained from watching the film.’ You should also mention that opportunity cost is not about money, but about the lost benefit of the next best option.
在模拟卷的B部分，一道简答题问道：“解释学生在决定如何使用10英镑时，可能会面临怎样的机会成本。”（4分）一份强劲的答案会明确指出两个清晰的选项，并点出机会成本。例如：“学生可以用10英镑买一本新书，也可以去看电影。如果她选择了书，机会成本便是她从看电影中本可获得的享受。”你还应点明，机会成本无关金钱，而是关乎放弃的次优选项所带来的利益。
7. Introduction to Demand | 需求简介
The mock paper includes a demand schedule for chocolate bars. It shows that when the price is £1, quantity demanded is 50 bars; at £2, demand falls to 30 bars; and at £3, only 10 bars are demanded. This illustrates the law of demand: as the price of a good rises, the quantity demanded generally falls, assuming other factors stay the same.
模拟卷提供了一份巧克力棒的需求表。表格显示，当价格为1英镑时，需求量为50根；价格为2英镑时，需求量降至30根；而价格为3英镑时，只有10根被需求。这说明了需求定律：在其他条件不变的情况下，随着商品价格上升，需求量通常会下降。
Economists call this an inverse relationship between price and quantity demanded. When you plot a demand curve, it slopes downwards from left to right. In an exam, you might be asked to draw a demand curve from a given table, so it is important to label the axes correctly – price on the vertical axis and quantity on the horizontal axis.
经济学家称此为价格与需求量之间的反向关系。当你绘制需求曲线时，它会从左到右向下倾斜。在考试中，你可能需要根据给定表格画出需求曲线，因此正确标记坐标轴非常重要——纵轴为价格，横轴为数量。
8. Interpreting a Demand Curve | 解读需求曲线
To plot the demand curve from the mock data, you would place three points on a graph: (50, £1), (30, £2) and (10, £3). Joining these points produces a downward-sloping straight line. The demand curve is a visual way to see how much of a product consumers are willing and able to buy at different prices.
要根据模拟数据绘制需求曲线，你需要在图上标出三个点：(50, £1)、(30, £2) 和 (10, £3)。将这些点连接起来就得到一条向下倾斜的直线。需求曲线可以直观地展示消费者在不同价格下愿意并且能够购买的商品数量。
If a question asks you to read a demand curve, remember to use the price to find the corresponding quantity. For example, at a price of £2.50, you would go to the curve and read downwards to estimate the quantity demanded. Exams may also test your understanding that a movement along the demand curve is caused only by a change in the good’s own price.
如果题目要求解读需求曲线，记住用价格来找到对应的数量。例如，在2.50英镑的价格下，你要在曲线上找到该点，然后向下读取估算的需求量。考试还可能考查你这一理解：沿着需求曲线的移动仅由商品本身价格的变化引起。
9. Calculating Total Revenue | 计算总收入
Another question in the mock paper asks you to calculate total revenue at a price of £2. The formula for total revenue (TR) is:
Total Revenue = Price × Quantity
Using the demand schedule, when price = £2, quantity demanded = 30. So:
TR = £2 × 30 = £60
Total revenue is the money a firm receives from selling its products. It is always measured in pounds (£) in WJEC exams. A common mistake is to confuse quantity with revenue, so make sure you multiply price by quantity, not just write down the quantity.
模拟卷中还有一道题要求你计算价格为2英镑时的总收入。总收入(TR)的公式为：
总收入 = 价格 × 数量
根据需求表，当价格 = 2英镑，需求量 = 30。因此：
TR = 2英镑 × 30 = 60英镑
总收入是企业销售产品所获得的货币。在WJEC考试中，它总是以英镑(£)为单位。一个常见错误是把数量误认为收入，所以务必确认你用价格乘以数量，而不是仅仅写下数量。
10. Real-World Application: Pocket Money Decision | 实际应用：零花钱决策
Economists use the concept of opportunity cost all the time to explain everyday decisions. Consider Jamie, a Year 7 student who receives £5 pocket money. He can either buy a comic book costing £5 immediately or save the £5 to put towards a £20 video game he wants next month. If Jamie buys the comic, the opportunity cost is the progress towards the video game that he sacrifices. There is also a time element – he must wait longer if he saves.
经济学家时刻用机会成本这一概念来解释日常决策。设想七年级学生杰米获得了5英镑零花钱。他可以立刻买一本价值5英镑的漫画书，或者将这5英镑存起来，用于下个月购买心仪的20英镑电子游戏。如果杰米买了漫画，机会成本便是他为电子游戏储蓄所放弃的进展。这里还包含了时间因素——如果选择储蓄，他需要等待更久。
In an exam, applying economics to real-life situations shows deeper understanding. When you are asked to explain a choice, always identify the two best alternatives, state clearly which one is chosen, and then specify what is forgone. This three-step structure is a reliable way to earn full marks on opportunity cost questions.
在考试中，将经济学应用于现实情境能体现出更深层的理解。当被要求解释一个选择时，务必先点出两个最佳选项，明确说明选择了哪一个，然后具体指出放弃了什么。这一三步结构是获得机会成本类题目满分的可靠方法。
11. Tackling Multiple-Choice Questions | 解决选择题
Section A of a WJEC paper often feels fast-paced, but you can maximise your marks with a clear strategy. First, read the question carefully and underline the command word, such as ‘What is…’ or ‘Which of the following…’. Then, try to answer without looking at the options. This prevents the distractors from confusing you. Finally, cross out obviously wrong answers and select the best fit.
WJEC试卷的A部分通常节奏较快，但清晰的策略能让你最大化得分。首先，仔细读题并在指令词下划线，比如“什么是……”或“以下哪项……”。然后，尝试在不看选项的情况下先作答。这样可以防止干扰项让你混乱。最后，划掉明显错误的答案，再选择最合适的那个。
Be careful with negatives in questions. If a question says ‘Which of the following is NOT a factor of production?’ you should immediately mark that NOT and remind yourself you are looking for the odd one out. Also, manage your time by spending no more than about one minute per multiple-choice question. If you are stuck, star the question and return to it later.
要留意题目中的否定词。如果题目问道“以下哪项不是生产要素？”，你应该立即标记这个“不是”，并提醒自己你正在找那个异类。此外，管理好时间，每道选择题最多花一分钟。如果卡住了，就标记星号，之后再回头做。
12. Writing a Strong Short Answer | 撰写优秀简答题
Section B questions often start with a scenario and ask you to ‘Explain’ something. For the £10 spending question, a high-scoring answer would look like this: ‘Opportunity cost is the next best alternative given up when making a choice. For example, a student with £10 might choose between a cinema ticket (£10) and a new T-shirt (£10). If the student chooses the cinema ticket, the opportunity cost is the T-shirt. The opportunity cost is not the money, because the money would have been spent either way; it is the benefit of the T-shirt that is lost.’ This answer defines, applies, and explains the concept clearly.
B部分的题目常常先给出一个情境，然后要求你“解释”某事。对于关于10英镑花费的题目，一份高分答案可以写成这样：“机会成本是做出选择时所放弃的次优选项。例如，一名学生有10英镑，他可以在电影票（10英镑）和一件新T恤（10英镑）之间做选择。如果学生选择了电影票，机会成本就是那件T恤。机会成本不是金钱，因为钱无论如何都会被花掉；被放弃的是拥有那件T恤的利益。”这个答案清晰地定义、应用并解释了这一概念。
To boost your marks, always use the word ‘because’ to show reasoning, and connect your answer back to the scenario. Exam marks are awarded for defining the term, identifying the alternatives, stating what is forgone, and explaining why that cost matters. Practising this structure with different scenarios will make your answers far stronger.
为了提高得分，一定要使用“因为”这样的词来展示推理过程，并把答案和情境联系起来。考试采分点在于：定义术语，指出各个选项，说明放弃了什么，并解释该成本为何重要。在不同的情境下练习这一结构，会让你的答案扎实得多。
Published by TutorHao | Economics Revision Series | aleveler.com
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